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.

Spell of Mask · Speed Duel: Battle City Box 300302018/223

Spell of Mask (Speed Duel: Battle City Box 300302018/223), Common. Market price $0.23, unchanged this week. Prices are estimates from TCGPlayer and Cardmarket, not guaranteed values.

Activate the following Skill(s). ● If a Ritual Summoned "The Masked Beast" you control is destroyed by an opponent's card effect, you can Special Summon "Masked Beast Des Gardius" from your hand, Deck or GY, ignoring its Summoning conditions. ● You can Tribute 1 "Masked Beast Des Gardius", then add 1 "The Masked Beast" and 1 "Curse of the Masked Beast" from your Deck and/or GY to your hand. Each of these Skills can only be used once per Duel.

Weekly price history

Week	Market price
2026-W31	$0.22
2026-W32	$0.22
2026-W33	$0.22
2026-W34	$0.22
2026-W35	$0.22
2026-W36	$0.23
2026-W37	$0.23
2026-W38	$0.23
2026-W39	$0.23

Questions

How much is Spell of Mask 300302018/223 worth?

Spell of Mask from Speed Duel: Battle City Box (300302018/223) has a market estimate of $0.23, unchanged this week. Prices are estimates from TCGPlayer and Cardmarket.

Is Spell of Mask 300302018/223 rare?

It is a Common from Speed Duel: Battle City Box, a 223-card set.

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