Champions of the Perfect is a rare Creature — Elf Warrior card from Lorwyn Eclipsed Promos (PECL), collector number 171p. Current market price: $1.62 (foil $1.72), TCGplayer market prices via Scryfall.
As an additional cost to cast this spell, behold an Elf and exile it. (Exile an Elf you control or an Elf card from your hand.) Whenever you cast a creature spell, draw a card. When this creature leaves the battlefield, return the exiled card to its owner's hand.