Ivysaur

{1}{g}{g} tap target creature
at the beginning of your turn, put a growthcounter
on Ivysaur. whenever there are 4 or more
growthcounters on Ivysaur, evolve
(sacrifice Ivysaur and search your hand and library
for a Venusaur and put it onto the battlefield)
you cannot cast Ivysaur