Mouth of the Storm is a uncommon Creature — Elemental card from Edge of Eternities (EOE), collector number 70. Current market price: $0.15 (foil $0.19), TCGplayer market prices via Scryfall.
Flying Ward {2} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {2}.) When this creature enters, creatures your opponents control get -3/-0 until your next turn.