Thunderclap Drake is a rare Creature — Drake card from Outlaws of Thunder Junction Commander (OTC), collector number 17. Current market price: $3.26, TCGplayer market prices via Scryfall.
Flying Instant and sorcery spells you cast cost {1} less to cast. {2}{U}, Sacrifice this creature: When you next cast an instant or sorcery spell this turn, copy it for each time you've cast your commander from the command zone this game. You may choose new targets for the copies.