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.

Mass Calcify · Magic 2015 18/284

Mass Calcify (Magic 2015 18/284), Rare, Sorcery. Market price $6.10, unchanged this week. Illustrated by Brandon Kitkouski. Prices are estimates from TCGPlayer and Cardmarket, not guaranteed values.

Weekly price history

Week	Market price
2026-W31	$4.03
2026-W32	$5.96
2026-W33	$6.47
2026-W34	$5.97
2026-W35	$6.13
2026-W36	$6.68
2026-W37	$5.93
2026-W38	$6.10
2026-W39	$6.10

Questions

How much is Mass Calcify 18/284 worth?

Mass Calcify from Magic 2015 (18/284) has a market estimate of $6.10, unchanged this week. Prices are estimates from TCGPlayer and Cardmarket.

Is Mass Calcify 18/284 rare?

It is a Rare from Magic 2015, a 284-card set.

Browse more Magic: The Gathering cards · All Magic 2015 cards · Build a deck · Track your collection