Aven Interrupter is a rare Creature — Bird Rogue card from Outlaws of Thunder Junction Promos (POTJ), collector number 4p. Current market price: $3.17 (foil $4.74), TCGplayer market prices via Scryfall.
Flash Flying When this creature enters, exile target spell. It becomes plotted. (Its owner may cast it as a sorcery on a later turn without paying its mana cost.) Spells your opponents cast from graveyards or from exile cost {2} more to cast.