Emergent Haunting

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.)

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6ocics8nnjpb1huofynlek.