Can I build a deck together with friends on TCGSwap?

Yes. Every deck on TCGSwap has a Collaboration Space. You can invite up to 5 friends; they can suggest card changes, discuss ideas, and playtest proposals. You review and apply suggestions before anything changes in your deck.

How does deck collaboration work?

It works like a pull request for your deck. Collaborators open the deck editor, make their proposed changes, and submit a suggestion with a note. You get notified, open the comparison view to see exactly what they changed, and choose to apply all, cherry-pick individual cards, or decline. Nothing changes in your deck until you approve it.

Can collaborators chat and discuss the deck?

Yes. The Collaboration Space has a shared group discussion thread for the whole deck, plus a per-suggestion Q&A thread for each proposal. You can @mention teammates and link specific cards inline.

Is collaborative deck building free?

Yes, collaboration is free for all TCGSwap users during beta. You can invite up to 5 collaborators per deck.

Does TCGSwap work for MTG, Pokémon, Yu-Gi-Oh and One Piece collaboration?

Yes. The Collaboration Space supports all four games — Magic: The Gathering, Pokémon TCG, Yu-Gi-Oh and One Piece. Format validation and card prices are included for each game.

Subterror Behemoth Stalagmo · The Dark Illusion: Special Edition 78202553/4

Subterror Behemoth Stalagmo (The Dark Illusion: Special Edition 78202553/4), Ultra Rare. Market price $1.43, unchanged this week. Prices are estimates from TCGPlayer and Cardmarket, not guaranteed values.

FLIP: You can discard 1 "Subterror" monster, and if you do, draw 2 cards. You can only use this effect of "Subterror Behemoth Stalagmo" once per turn. When a face-up monster you control is flipped face-down, if you control no face-up monsters: You can Special Summon this card from your hand in Defense Position. Once per turn: You can change this card to face-down Defense Position.

Weekly price history

Week	Market price
2026-W31	$1.43
2026-W32	$1.44
2026-W33	$1.43
2026-W34	$1.43
2026-W35	$1.43
2026-W36	$1.42
2026-W37	$1.42
2026-W38	$1.43
2026-W39	$1.43

Questions

How much is Subterror Behemoth Stalagmo 78202553/4 worth?

Subterror Behemoth Stalagmo from The Dark Illusion: Special Edition (78202553/4) has a market estimate of $1.43, unchanged this week. Prices are estimates from TCGPlayer and Cardmarket.

Is Subterror Behemoth Stalagmo 78202553/4 rare?

It is an Ultra Rare from The Dark Illusion: Special Edition, a 4-card set.

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