Bellowing Aegisaur + Scurry Oak + Pandemonium

Bellowing Aegisaur
Scurry Oak
Pandemonium

Requires
Bellowing Aegisaur must be on the battlefield. Scurry Oak must be on the battlefield. Pandemonium must be on the battlefield.
Steps
  1. Give Bellowing Aegisaur indestructible by any method.
  2. Deal damage to Bellowing Aegisaur.
  3. Bellowing Aegisaur triggers, putting a +1/+1 counter on each other creature you control.
  4. Scurry Oak triggers, creating a 1/1 Squirrel creature token.
  5. The Squirrel enters the battlefield, triggering Pandemonium, dealing 1 damage to Bellowing Aegisaur.
  6. Repeat from step 3.
Results
Infinite +1/+1 counters on all creatures you control except Bellowing Aegisaur. Infinite creature tokens. Infinite ETB.

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