Grixis Grimblade is a common Creature — Zombie Warrior card from Alara Reborn (ARB), collector number 134. Current market price: $0.16 (foil $0.27), TCGplayer market prices via Scryfall.
As long as you control another multicolored permanent, this creature gets +1/+1 and has deathtouch. (Any amount of damage it deals to a creature is enough to destroy that creature.)