REVIEW: Frenops Black Core Cardstock for MTG Proxies: Worth It?

Black core cardstock is one of those proxy-making materials that sounds like the final answer until the printer starts jamming, the toner bill shows up, or the finished cards come out thicker than expected.

This Frenops LLC test is useful because it shows both sides of the story. The paper itself seems genuinely strong. The printing workflow around it is the part that gets expensive and annoying.

The original batch was 800 sheets of 330gsm black core cardstock plus 200 sheets of 300gsm blue core cardstock for $440. That is a serious bulk buy, but the math is not crazy if you are making a lot of proxies. Across the whole 1,000-sheet bundle, that is about $0.44 per sheet before shipping, taxes, toner, misprints, cutting waste, and printer wear.

At 8 to 9 cards per letter-size sheet, the blank cardstock alone lands around five cents per card before everything else. That is cheap compared to real MTG prices, but only if the setup actually works for you.

And that is the catch. This is not beginner inkjet paper. This is laser or UV territory.

What Was Tested

The cardstock came from Frenops LLC, which also appears on Amazon through the Color Tree’s/Frenops listing for 330gsm black core TCG cardstock. The tested batch had two materials:

The printer used at first was a Canon MF753CDW II laser printer. The results looked good enough that the paper got a strong first impression, but the later update matters a lot: the printer was returned after about a month because toner cost, saturation problems with third-party toner, jams, and slow deck printing made the setup hard to justify.

That changes the takeaway. This is not “buy this printer and you are done.” It is more like: the paper is interesting, but do the printer math before going all in.

Black Core vs Blue Core

Black core gets most of the attention because it sounds closest to real trading-card stock. A proper black core blocks light, improves opacity, and helps the card feel more serious than normal white cardstock. That is why black core is common in playing-card manufacturing.

But blue core can be the smarter choice in a sticker-paper workflow.

If you are printing onto sticker paper and then applying that to a card base, 330gsm black core can easily become too thick. The sticker layer adds its own bulk. That is where the 300gsm blue core gets interesting: it gives you a thinner base, which can feel more natural once the sticker layer is added.

This is one of those places where “premium” is not automatically better. The best stock is the one that works with the full stack you are building.

If making proxies at home to save money, the blue core point is a good reminder: do not buy the most expensive material just because it sounds closest to real cards. Buy the material that fits the method.

This Is Not Inkjet Paper

The biggest compatibility warning is simple: this cardstock is not for normal inkjet direct printing.

The paper is thick, smooth, and coated in a way that does not play well with typical inkjet ink. If it feeds at all, the ink may not dry properly on the surface. That is not a small flaw. It can mean smearing, poor adhesion, bad blacks, and wasted sheets.

For inkjet users, the better route is usually printing onto compatible photo paper, sticker paper, or a stock designed for inkjet. If you want to use this kind of black or blue core with an inkjet setup, the safer route is the sticker method: print on inkjet-compatible sticker paper first, then apply it to the card base.

For more inkjet-friendly paper routes, check Top MTG Papers. For the bigger printer decision, Laser vs Inkjet for MTG Proxies is the better starting point.

Direct Laser Printing: Good Results, Real Costs

The Canon laser printer used here could feed the 330gsm stock from both the drawer and multipurpose tray, with occasional jams. That sounds promising, and the photos back up that the prints can look good.

But the later update is the part I would take seriously. The starter toner ran out quickly. Third-party toner looked good at first, then color saturation started drifting badly. The paper also began jamming more often, and the printer had to heat and cool between sheets, making full-deck printing slow.

That is exactly the kind of thing that kills a home method. Not because it cannot work, but because it stops being fun or cheap enough to justify.

For one or two special decks, maybe that tradeoff is fine. For a constant home proxy workflow, OEM toner cost can get painful fast.

The Price Math Needs Context

The headline number, 1,000 sheets for $440, looks great compared with buying tiny packs. It works out to about $0.44 per sheet across the full bundle.

But the bundle mixed 800 black core sheets and 200 blue core sheets, so it does not give a clean black-core-only price. Also, bulk discounts and sales change the math. Buying small packs, buying at full price, or needing a different sheet size can change the value completely.

There is also a layout issue. Letter-size sheets usually fit 9 standard cards if you are doing a normal grid, but some cutter or Silhouette workflows may effectively use fewer cards per sheet depending on guide marks, alignment, or margins. Waste matters.

I like the bulk-buy logic only if you already know your printer can handle the paper. Buying 1,000 sheets before testing 20 is the kind of confidence that gets expensive.

What the Images Are Useful For

The post includes several result photos. The phone camera was not ideal, so these should not be treated like lab-grade print comparisons. They are still useful because they show the kind of result the cardstock can produce when the printer behaves.

The most useful thing to look for is not whether the photo looks “real.” Look for obvious curling, border cleanliness, color density, and whether the card would pass the sleeve test at table distance.

Curling, Jams, and Flattening

Some of the cards looked curled in the photos. The explanation given was laser heat: the printer heat can make the sheet curl, and running it through a laminator can flatten it back out.

That is different from laminating the card as part of the proxy construction. In this workflow, the cardstock was printed as-is, not laminated for play. The laminator was being used to flatten curled sheets.

I would keep those two ideas separate:

If the whole point of buying proper black core stock is to avoid the laminated homemade feel, adding lamination back on top defeats part of the purpose. Sleeves already handle protection for normal play. The stock itself should be doing the rigidity work.

Sticker Method: Why the 300gsm Blue Core Matters

The 300gsm blue core is quietly the most practical part of the post for a lot of home proxy makers.

Direct black core printing needs the right laser or UV setup. Sticker method is easier to do with cheaper inkjet setups because you print the face onto sticker paper first, then apply it to a card base.

The problem is thickness. Sticker paper plus 330gsm black core can become a chunky card. A thinner 300gsm blue core base can make the final sleeved card feel closer to normal.

That is the bigger lesson: judge the full finished card, not the raw paper. If your process adds a sticker layer, adhesive, laminate, or UV ink thickness, the base stock should usually be thinner.

UV Printing Is a Different Game

UV printing came up because the seller included some foil cardstock to test with a UV printer. That sounds exciting, but it is not the same world as a home inkjet or office laser printer.

With UV, final thickness becomes a serious issue. If the base stock is already 330gsm, and you add UV ink layers on both sides, the finished card can become noticeably thicker than a normal Magic card.

For UV work, I would be more cautious with 330gsm stock and would seriously look at 300gsm options first. The question is not only “can it print?” The question is “what is the final sleeved thickness after both faces are printed?”

When This Supplier Makes Sense

Frenops/Color Tree’s looks interesting if you want actual black core or blue core stock in the US and you are not satisfied with sticker-only or laminate builds.

It makes the most sense when:

• You already have a compatible laser or UV printer.
• You are willing to test small packs before buying bulk.
• You care about opacity and real card feel.
• You are printing enough cards for bulk pricing to matter.
• You understand toner or UV printing costs before committing.

It makes less sense when:

• You only have a normal inkjet printer.
• You want the cheapest possible playtest proxies.
• You are not ready to troubleshoot jams and feed issues.
• You are printing one casual deck and do not want bulk stock sitting around.
• You are relying on third-party toner without testing color stability first.

There is a real quality argument here. There is also a real cost argument against it. Both can be true.

What I’d Actually Do

I would not start with the 1,000-sheet bulk order.

The smart move is to buy the smallest test batch you can get, then test three things before buying more: feed reliability, toner adhesion, and finished sleeve feel.

If those tests pass, then the Frenops bulk buy becomes interesting. If they fail, the paper may still be good, but it is not good for your setup.

That distinction matters. Good material in the wrong workflow is still a waste of money.

Likely Problems and Fixes

Final Take

I like the paper side of this test more than the printer side.

The cardstock looks promising. The 330gsm black core makes sense for direct laser or UV printing. The 300gsm blue core is probably the more practical discovery for sticker-method proxy makers because it keeps the final card from getting too thick.

The Canon laser workflow is the part I would be careful with. Good results are possible, but toner cost, saturation drift, jams, and slow full-deck printing can turn it from “home proxy upgrade” into “why did I buy all this?” very quickly.

If the goal is premium-feeling proxies and you already have the right printer, Frenops is worth testing. If the goal is cheap casual playtest cards, this is probably overkill. Buy a small pack first, run the ugly tests, sleeve the results, and only then think about bulk.

That is the money-conscious proxy maker answer: pay for better material when it actually improves the finished card, but do not let the setup become more expensive than the cards you were trying not to buy.

For more cardstock comparisons, start with Top MTG Papers. For printer compatibility, check Top Printers and Laser vs Inkjet for MTG Proxies.

Inspired by: I’ve confirmed the best supplier for black core cardstock by u/BerryPsychological75.