Thrun, Breaker of Silence is a rare Legendary Creature — Troll Shaman card from Phyrexia: All Will Be One (ONE), collector number 186. Current market price: $0.31 (foil $0.32), TCGplayer market prices via Scryfall.
This spell can't be countered. Trample Thrun can't be the target of nongreen spells your opponents control or abilities from nongreen sources your opponents control. During your turn, Thrun has indestructible.