Exchange of Words + Ley Weaver + Mutavault

Prerequisites

• Mutavault does not have summoning sickness.
• You control at least one additional land.

Steps

1. 1Activate Mutavault's second ability by paying , causing it to become a 2/2 creature with all creature types in addition to its other types.
2. 2Cast Exchange of Words by paying .
3. 3When Exchange of Words enters the battlefield, it triggers, exchanging the text boxes of Ley Weaver and Mutavault.
4. 4Activate Mutavault by tapping it, untapping itself and any other land you control.
5. 5Repeat step 4.

Effects

• Infinite mana lands you control can produce
• Infinite untap of lands you control