Survival of the Fittest 

Enchantment
, Discard a creature card: Search your library for a creature card, reveal that card, put it into your hand, then shuffle.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyNOT LEGALvintageLEGALcommanderLEGAL