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.

Darkness Energy · Undaunted 79/90

Darkness Energy (Undaunted 79/90), Uncommon. Market price €0.45, up 7.1% this week. Illustrated by Kent Kanetsuna. Prices are estimates from TCGPlayer and Cardmarket, not guaranteed values.

Card text

If the Pokémon Darkness Energy is attached to attacks, the attack does 10 more damage to the Active Pokémon (before applying Weakness and Resistance). Ignore this effect if the Pokémon that Darkness Energy is attached to isn’t Darkness. Darkness Energy provides Darkness Energy. (Doesn’t count as a basic Energy card.)

Weekly price history

Week	Market price
2026-W31	€0.52
2026-W32	€0.50
2026-W33	€0.50
2026-W34	€0.44
2026-W35	€0.44
2026-W36	€0.43
2026-W37	€0.42
2026-W38	€0.42
2026-W39	€0.45

Printings & variants

Normal — $0.73
Reverse Holo — $1.98

Questions

How much is Darkness Energy 79/90 worth?

Darkness Energy from Undaunted (79/90) has a market estimate of €0.45, up 7.1% this week. Prices are estimates from TCGPlayer and Cardmarket.

Is Darkness Energy 79/90 rare?

It is an Uncommon from Undaunted, a 90-card set.

Is Darkness Energy 79/90 tournament legal?

Darkness Energy 79/90 has rotated out of the current formats.

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