Thraximundar is a rare Legendary Creature — Zombie Assassin card from Double Masters 2022 (2X2), collector number 287. Current market price: $1.28 (foil $1.62), TCGplayer market prices via Scryfall.
Haste Whenever Thraximundar attacks, defending player sacrifices a creature of their choice. Whenever a player sacrifices a creature, you may put a +1/+1 counter on Thraximundar.