Karrthus, Tyrant of Jund is a mythic Legendary Creature — Dragon card from Secret Lair Drop (SLD), collector number 1250. Current market price: $17.68 (foil $21.40), TCGplayer market prices via Scryfall.
Flying, haste When Karrthus enters, gain control of all Dragons, then untap all Dragons. Other Dragon creatures you control have haste.