Bellowing Aegisaur + Scurry Oak + Pandemonium

Prerequisites

• You have a way to give Bellowing Aegisaur indestructible.
• You have a way to deal damage to Bellowing Aegisaur.

Steps

1. 1Give Bellowing Aegisaur indestructible by any method.
2. 2Deal damage to Bellowing Aegisaur.
3. 3Bellowing Aegisaur triggers, putting a +1/+1 counter on each other creature you control.
4. 4Scurry Oak triggers, creating a 1/1 Squirrel creature token.
5. 5The Squirrel enters the battlefield, triggering Pandemonium, dealing 1 damage to Bellowing Aegisaur.
6. 6Repeat from step 3.

Effects

• Infinite +1/+1 counters on most creatures you control
• Infinite creature ETB
• Infinite creature tokens