A Display of My Dark Power

When you set this scheme in motion, until your
next turn, whenever a player taps a land for mana, that player adds one mana of any type that land produced.

Sauron was become now a sorcerer of dreadful power, master of shadows and of phantoms, foul in wisdom, cruel in strength, misshaping what he touched, twisting what he ruled, lord of werewolves; his dominion was torment.