Karn Liberated is a mythic Legendary Planeswalker — Karn card from Modern Masters 2015 (MM2), collector number 4. Current market price: $3.43 (foil $5.49), TCGplayer market prices via Scryfall.
+4: Target player exiles a card from their hand. −3: Exile target permanent. −14: Restart the game, leaving in exile all non-Aura permanent cards exiled with Karn. Then put those cards onto the battlefield under your control.