Questing Beast is a mythic Legendary Creature — Beast card from The List (PLST), collector number ELD-171. Current market price: $2.74, TCGplayer market prices via Scryfall.
Vigilance, deathtouch, haste Questing Beast can't be blocked by creatures with power 2 or less. Combat damage that would be dealt by creatures you control can't be prevented. Whenever Questing Beast deals combat damage to an opponent, it deals that much damage to target planeswalker that player controls.