Exchange of Words, Ley Weaver, and Mishra's Factory

Prerequisites

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

Steps

1. Activate Mishra's Factory's second ability by paying , causing it to become a 2/2 Aseembly-Worker artifact creature 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 Mishra's Factory
4. Activate Mishra's Factory 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