Obsessive Astronomer 
Creature — Human Wizard
If it's neither day nor night, it becomes day as this creature enters. Whenever day becomes night or night becomes day, discard up to two cards, then draw that many cards.
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL