Surtland Flinger is a rare Creature — Giant Berserker card from Kaldheim (KHM), collector number 377. Current market price: $0.33, TCGplayer market prices via Scryfall.
Whenever this creature attacks, you may sacrifice another creature. When you do, this creature deals damage equal to the sacrificed creature's power to any target. If the sacrificed creature was a Giant, this creature deals twice that much damage instead.