Breloth, Beastmaster of Greph

When Breloth, Beastmaster of Greph enters the battlefield, search your library for a Beast card, reveal it, then shuffle your library and put that card on top of it.
Trample, Haste
Whenever you cast a Beast spell, put X +1/+1 counters on target creature you control, where X is one plus a third of the number of beasts you control, rounded down.