Drift of Phantasms is a common Creature — Spirit card from The List (PLST), collector number RAV-46. Current market price: $0.32, TCGplayer market prices via Scryfall.
Defender (This creature can't attack.) Flying Transmute {1}{U}{U} ({1}{U}{U}, Discard this card: Search your library for a card with the same mana value as this card, reveal it, put it into your hand, then shuffle. Transmute only as a sorcery.)