O-Kagachi, Vengeful Kami is a mythic Legendary Creature — Dragon Spirit card from Mystery Booster 2 (MB2), collector number 138. Current market price: $0.40, TCGplayer market prices via Scryfall.
Flying, trample Whenever O-Kagachi deals combat damage to a player, if that player attacked you during their last turn, exile target nonland permanent that player controls.