Bulbasaur

Evolve 1: Bulb (If you have the corresponding
Evolve 2 creature, you may play it on top of this
creature for it's mana cost subtracted by this creatures
mana cost.)
{t}: Add {g} to your mana pool. Spend this mana
only to play creature spells.
"Bulbasaur can be seen napping in bright sunlight.
There is a seed on its back. By soaking up the sun's
rays, the seed grows progressively larger."