Ashaya, Soul of the Wild, Argothian Elder, and Prodigal Pyromancer

Prerequisites

• Ashaya, Soul of the Wild on the battlefield
• Argothian Elder on the battlefield
• Prodigal Pyromancer on the battlefield
• Argothian Elder and Prodigal Pyromancer do not have summoning sickness

Steps

1. Activate Prodigal Pyromancer by tapping it, dealing 1 damage to any target
2. Activate Argothian Elder by tapping it, untapping itself and Prodigal Pyromancer
3. Repeat

Results

• Infinite damage
• Infinite mana lands you control can produce
• Infinite untaps of creatures you control
• Infinite untaps of lands you control