Emergent Haunting is a uncommon Enchantment card from Outlaws of Thunder Junction (OTJ), collector number 46. Current market price: $0.16 (foil $0.15), TCGplayer market prices via Scryfall.
At the beginning of your end step, if you haven't cast a spell from your hand this turn and this enchantment isn't a creature, it becomes a 3/3 Spirit creature with flying in addition to its other types. {2}{U}: Surveil 1. (Look at the top card of your library. You may put it into your graveyard.)