Ashaya, Soul of the Wild, Weaver of Harmony, and Nature's Will

Prerequisites

• Ashaya, Soul of the Wild on the battlefield
• Weaver of Harmony on the battlefield
• Nature's Will on the battlefield
• Weaver of Harmony does not have summoning sickness
• You control a creature other than Weaver of Harmony that can attack this turn and that cannot be blocked by an opponent
• You control at least two mana-producing lands except Weaver of Harmony, one of which must be a Forest

Steps

1. Deal combat damage to an opponent using a creature other than Weaver of Harmony, triggering Nature's Will
2. Holding priority, activate all mana-producing lands you control except Weaver of Harmony by tapping them, adding at least
3. Activate Weaver of Harmony by paying and tapping it, copying Nature's Will's trigger
4. Resolve the copy of Nature's Will's trigger, untapping all lands you control and tapping all lands the defending player controls
5. Repeat from step 2

Results

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