Exchange of Words, Ley Weaver, and Mutavault

Prerequisites

• Exchange of Words in hand
• Ley Weaver on the battlefield
• Mutavault on the battlefield
• Mutavault does not have summoning sickness
• You control at least one additional land
• available

Steps

1. Activate 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. Cast Exchange of Words by paying
3. When Exchange of Words enters the battlefield, it triggers, exchanging the text boxes of Ley Weaver and Mutavault
4. Activate Mutavault by tapping it, untapping itself and any other land you control
5. Repeat step 4

Results

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