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.

Ghost Sleeper, the Underworld Princess · Battles of Legend: Monstrous Revenge 99370594/104

Ghost Sleeper, the Underworld Princess (Battles of Legend: Monstrous Revenge 99370594/104), Ultra Rare. Market price $0.16, down 5.9% this week. Prices are estimates from TCGPlayer and Cardmarket, not guaranteed values.

If this card is sent to the GY: You can add 1 "Ghost Fusion" from your Deck to your hand. If this card is in your GY, except the turn it was sent there: You can banish this card and discard 1 card, then target 1 of your banished Level 4 or higher Zombie monsters; add it to your hand. You can only use each effect of "Ghost Sleeper, the Underworld Princess" once per turn.

Weekly price history

Week	Market price
2026-W31	$0.21
2026-W32	$0.22
2026-W33	$0.22
2026-W34	$0.23
2026-W35	$0.23
2026-W36	$0.20
2026-W37	$0.18
2026-W38	$0.17
2026-W39	$0.16

Questions

How much is Ghost Sleeper, the Underworld Princess 99370594/104 worth?

Ghost Sleeper, the Underworld Princess from Battles of Legend: Monstrous Revenge (99370594/104) has a market estimate of $0.16, down 5.9% this week. Prices are estimates from TCGPlayer and Cardmarket.

Is Ghost Sleeper, the Underworld Princess 99370594/104 rare?

It is an Ultra Rare from Battles of Legend: Monstrous Revenge, a 104-card set.

Browse more Yu-Gi-Oh cards · All Battles of Legend: Monstrous Revenge cards · Build a deck · Track your collection