Eris, Roar of the Storm is a mythic Legendary Creature — Elemental Warlock card from Outlaws of Thunder Junction Commander (OTC), collector number 41. Current market price: $4.10 (foil $5.26), TCGplayer market prices via Scryfall.
This spell costs {2} less to cast for each different mana value among instant and sorcery cards in your graveyard. Flying, prowess Whenever you cast your second spell each turn, create a 4/4 red Dragon Elemental creature token with flying and prowess.