Mushroom forest

Mushroom Forest enters the battlefield tapped
{t}: add {u},{r} or {b}
{u}{b}{r}, {t}: Explore this biome (choose one at
random: create a 3/3 blue ray creature token or
create a red acid mushroom creature token with
sacrifice this artifact: acid mushroom deals 1
damage to any target or create a colorless
titanium artifact creature token with sacrifice this
artifact: draw a card.)