Wayta, Trainer Prodigy, Bellowing Aegisaur, Cacophodon, Temple Altisaur, and Quasiduplicate

Prerequisites

• Wayta, Trainer Prodigy on the battlefield
• Bellowing Aegisaur on the battlefield
• Cacophodon on the battlefield
• Temple Altisaur on the battlefield
• Quasiduplicate on the battlefield
• You control a permanent that can tap to produce at least
• You have enough mana to cast Quasiduplicate

Steps

1. Cast Quasiduplicate by paying its mana cost, creating a token copy of Bellowing Aegisaur
2. Activate a mana-producing permanent you control by tapping it, adding at least
3. Activate Wayta by paying and tapping it, causing Cacophodon and the nontoken Bellowing Aegisaur to fight each other, with each only taking 1 damage due to Temple Altisaur
4. Cacophodon and Bellowing Aegisaur each trigger twice
5. Resolve all Bellowing Aegisaur triggers, putting two +1/+1 counters on each other creature you control
6. Resolve both Cacophodon triggers, untapping the mana-producing permanent and Wayta
7. Repeat from step 2, alternating between having the token and nontoken Bellowing Aegisaur fight Cacophodon

Results

• Infinite +1/+1 counters