Rider on The Pale Horse

Impending 5 - {1}{b} (If you cast this spell for its impending cost, it enters with five time counters and isn’t a creature until the last is removed. At the beginning of your end step, remove a time counter from it.)

Whenever Rider on The Pale Horse enters or attacks, mill four cards, then you may return a non-Horror creature card from your graveyard to your hand.