我が闇の力の一片を見せよう/A Display of My Dark Power

Scheme -
When you set this scheme in motion, until your next turn, whenever a player taps a land for mana, that player adds one mana to his or her mana pool of any type that land produced.

Scheme -
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.