Skullbriar, the Walking Grave is a rare Legendary Creature — Zombie Elemental card from Commander Anthology Volume II (CM2), collector number 165. Current market price: $1.67, TCGplayer market prices via Scryfall.
Haste Whenever Skullbriar deals combat damage to a player, put a +1/+1 counter on it. Counters remain on Skullbriar as it moves to any zone other than a player's hand or library.