Zariel, Archduke of Avernus is a mythic Legendary Planeswalker — Zariel card from Adventures in the Forgotten Realms (AFR), collector number 172. Current market price: $2.74 (foil $4.15), TCGplayer market prices via Scryfall.
+1: Creatures you control get +1/+0 and gain haste until end of turn. 0: Create a 1/1 red Devil creature token with "When this token dies, it deals 1 damage to any target." −6: You get an emblem with "At the end of the first combat phase on your turn, untap target creature you control. After this phase, there is an additional combat phase."