Lenore, Watcher of the Stars

Lifelink, vigilance

As long as it is Night, you may cast spells as though they
had flash.

As long as it is Day, spells you cast cost {1} less to cast.

{1}{u}{b}{r}, {t}: Create an X/X colorless Horror creature token with annihilator 2, where X is the number of times
you have cast a commander from the command zone this game.