Venusaur

Evolve Ivysaur {g}{g} ({g}{g}, Exile an Ivysaur you
control: Put this card onto the battlefield from your
hand. Venusaur gets X +1/+1 counters, where X is
the exiled creatures power. Evolve only as a sorcery.)
Grass spells you cast cost {1} less to cast.
Other Grass creatures you control get +1/+1.
Trample