Wayta, Trainer Prodigy, Siegehorn Ceratops, and Cacophodon

Prerequisites

• Wayta, Trainer Prodigy on the battlefield
• Siegehorn Ceratops on the battlefield
• Cacophodon on the battlefield
• You control a permanent that can tap to produce at least
• Cacophodon has power equal to 1 or 2
• Siegehorn Ceratops' toughness is at least one greater than Cacophodon's power
• You have a way to give Cacophodon indestructible

Steps

1. Give Cacophodon indestructible, if needed
2. Activate a mana-producing permanent by tapping it, adding
3. Activate Wayta by paying and tapping it, causing Siegehorn Ceratops and Cacophodon to fight each other
4. Siegehorn Ceratops and Cacophodon trigger twice
5. Resolve both Siegehorn Ceratops trigger, putting four +1/+1 counters on it
6. Resolve both Cacophodon triggers, untapping Wayta and the mana-producing permanent
7. Repeat from step 2

Results

• Infinite +1/+1 counters on Siegehorn Ceratops