Fleeting Nightmare

Flying, phasing (This phases in or out before you untap during each of your untap steps. While it's phased out, it's treated as though it doesn't exist.)
At the beginning of the end step of a turn Fleeting Nightmare attacks, it phases out.
"While fledgling nightmares are quick to scare, they
are nonetheless just as dangerous as their matured
kin."
- Saracine, Researcher