Aqueous Form is a common Enchantment — Aura card from Theros (THS), collector number 39. Current market price: $0.30 (foil $3.17), TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature can't be blocked. Whenever enchanted creature attacks, scry 1. (Look at the top card of your library. You may put that card on the bottom.)