Regigigas, First Titan

Trample, Slow Start (Enters the battlefield tapped)
When Regigigas, First Titan enters the battlefield, choose a color or pay {5} to choose all
{t}: add {4} mana of the selected color. Use this
mana only to cast creature spells with golem as
the creature type
"All over the world, there are legends that tell of
Regigigas creating other Pokemon in its own image."
— The Pokedex