Mogg Assassin is a uncommon Creature — Goblin Assassin card from The List (PLST), collector number EXO-88. Current market price: $1.12, TCGplayer market prices via Scryfall.
{T}: You choose target creature an opponent controls, and that opponent chooses target creature. Flip a coin. If you win the flip, destroy the creature you chose. If you lose the flip, destroy the creature your opponent chose.