Steve, Incredible Builder

Whenever you cast an artifact spell untap Steve.
{r}, {t}: Create a red TNT artifact token.
{w}, {t}: Create a white 0/3 Cobblestone Wall
artifact creature token with defender.
{1}{u}, {t}: Create a blue Enchantment Table
artifact token.
{1}{g}, {t}: Create a 3/3 green Iron Golem artifact
creature token with trample.
{3}{b}, {t}: Create a TNT Cannon artifact token.