Blasting Station, Hardened Academic, and Obstinate Gargoyle

Prerequisites

• Blasting Station on the battlefield
• Hardened Academic on the battlefield
• Obstinate Gargoyle on the battlefield

Steps

1. Activate Blasting Station by tapping it and sacrificing Obstinate Gargoyle
2. When Obstinate Gargoyle dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
3. Hardened Academic and Blasting Station trigger
4. Resolve the Hardened Academic trigger, putting a +1/+1 counter on Obstinate Gargoyle
5. Resolve the Blasting Station trigger, untapping it
6. Resolve the Blasting Station ability from step 1
7. Repeat

Results

• Infinite mana creatures you control can produce
• Infinite untap of creatures you control
• Infinite ETB
• Infinite LTB
• Infinite damage
• Infinite death triggers
• Infinite sacrifice triggers