Mirran Spy, Cloudstone Curio, Ornithopter, and Krenko, Mob Boss

Prerequisites

• Mirran Spy on the battlefield
• Cloudstone Curio on the battlefield
• Ornithopter on the battlefield
• Krenko, Mob Boss on the battlefield
• Krenko does not have summoning sickness

Steps

1. Activate Krenko by tapping it, creating at least one 1/1 Goblin creature token
2. When the Goblin(s) enter the battlefield, Cloudstone Curio triggers that many times
3. Resolve the first trigger, returning Ornithopter to your hand from the battlefield
4. Resolve all remaining triggers, choosing to return nothing to your hand
5. Cast Ornithopter by paying
6. Mirran Spy triggers, untapping Krenko
7. Repeat

Results

• Infinite creature tokens
• Infinite ETB
• Infinite LTB
• Infinite storm count