Helios' Ascension

You may only cast Helios' Ascension if Sunlight
is active.
Target creature gets +3/+1 and gains flying until end of turn. Exile this creature the next time
Luna rises.
Eclipse - {w}: Put Helios' Ascension on the bottom of your library. Activate this ability only when a player has 10 life or less.
Devotion to Helios circumvents all cost.