Celestus Sanctifier 
Creature — Human Cleric
If it's neither day nor night, it becomes day as this creature enters. Whenever day becomes night or night becomes day, look at the top two cards of your library. Put one of them into your graveyard.
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL