Larenkra, Crafter of Beings

Larenkra, Crafter of Beings is all colors.
Indestructible, defender
Whenever you cast a creature spell, search your
library for a creature card, shuffle your library
and then put that card on top.
{w}{u}{b}{r}{g}, {ut}: Other creatures you control get
+5/+5 until end of turn. Activate this ability
only once each turn.