Startling Development is a common Instant card from Ikoria: Lair of Behemoths (IKO), collector number 68. Current market price: $0.20 (foil $0.20), TCGplayer market prices via Scryfall.
Until end of turn, target creature becomes a blue Serpent with base power and toughness 4/4. Cycling {1} ({1}, Discard this card: Draw a card.)