Goblin Psychopath is a uncommon Creature — Goblin Mutant card from Scourge (SCG), collector number 95. Current market price: $0.15 (foil $0.58), TCGplayer market prices via Scryfall.
Whenever this creature attacks or blocks, flip a coin. If you lose the flip, the next time it would deal combat damage this turn, it deals that damage to you instead.