Gravekeeper's Watcher is a Common Effect Monster card from Yu-Gi-Oh! (Dark Revelation Volume 1, DR1). Current market price: $0.64.
Common
Dark Revelation Volume 1 (DR1)
Card Text
During either player's turn, when your opponent activates a Spell/Trap Card or monster effect that could make them discard when it resolves: You can send this card from your hand to the Graveyard; negate the activation, and if you do, destroy it.
