Astros' Geomancer

Reach
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Whenever a creature enters the battlefield under
your control, add X {g} to your mana pool where
X is that creatures power.
{x}{g}{g}, {t}: Target creature gets +X/+X and
gains trample until end of turn.