this post was submitted on 20 Oct 2025
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How to check deck legality and build decks on a custom format? (mtgzone.com)
submitted 2 months ago* (last edited 2 months ago) by counterspell@mtgzone.com to c/mtg@mtgzone.com
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Hi everyone, I’m trying to build decks for a custom format using this card pool (f:standard tix<=0.1 usd<=1). I have a deck here: deck link.

I know legality is ultimately whatever rules you define for a custom format, but I’m looking for a practical way to check a deck automatically against a specific pool, rather than checking each card one by one. For reference, Penny Dreadful has a deck legality checker. I’m wondering if there’s something similar for generic card pools, or if manual checking is the only option.

Is there an easy way to check if the deck is legal for this pool and identify any cards that aren’t allowed? Also, I’d love tips or strategies for making deckbuilding simple in a custom format like this. Thanks!

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[–] KoboldCoterie@pawb.social 2 points 2 months ago* (last edited 2 months ago) (1 children)

I'm not aware of a single tool, but you could ensure the deck is standard legal in any normal deck building tool, then additionally check it against the Penny Dreadful deck checker - if it passes both, it should be legal in your format (assuming I understand what you're doing correctly.)

Edit: Nevermind, I see you're limiting it to $1, not $0.01, despite borrowing the name. Penny Dreadful checker won't work.

[–] counterspell@mtgzone.com 1 points 2 months ago

I’m not aware of a single tool, but you could ensure the deck is standard legal in any normal deck building tool, then additionally check it against the Penny Dreadful deck checker - if it passes both, it should be legal in your format (assuming I understand what you’re doing correctly.)

Edit: Nevermind, I see you’re limiting it to $1, not $0.01, despite borrowing the name. Penny Dreadful checker won’t work.

Yeah Penny Dreadful uses tix<=0.02 and this uses both tix<=0.1 and usd<=1