Omnath, Locus of Rage is a mythic Legendary Creature — Elemental card from Secret Lair Drop (SLD), collector number 1256. Current market price: $37.63 (foil $44.82), TCGplayer market prices via Scryfall.
Landfall — Whenever a land you control enters, create a 5/5 red and green Elemental creature token. Whenever Omnath or another Elemental you control dies, Omnath deals 3 damage to any target.