Osomeer, Emissary of Fauna

Trample, Reach

Whenever you cast a creature spell that is 4 mana or less, put a +1/+1 counter on it and gains, "Tap this creature, Add one of any color to your mana pool."

Whenever you cast a creature spell that is 5 mana or more, make a copy of it, except it has no abilities and cannot attack or block. Exile the copies at your end step.

Creatures you cast with mana costs 5 or more cost {1} less to cast for each copy you control this turn.