The Green

Eminence - Terraforming: Whenever a land enters
the battlefield; add one mana of the
color that land could produce. Mana gained this
way doesn't expire until the end of your next turn.
{x}{b}{r}: If you have mana floating of any color (colorless included) deal {x} damage to all
opponents and tap all untapped creatures.
(X must be minimum 1)