Tolarian Terror is a common Creature — Serpent card from Dominaria United (DMU), collector number 72. Current market price: $0.28 (foil $0.34), TCGplayer market prices via Scryfall.
This spell costs {1} less to cast for each instant and sorcery card in your graveyard. Ward {2} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {2}.)