Blasting Station, Putrid Goblin, and Hardened Academic

Prerequisites

• Blasting Station on the battlefield
• Putrid Goblin on the battlefield
• Hardened Academic on the battlefield

Steps

1. Activate Blasting Station by tapping it and sacrificing Putrid Goblin
2. When Putrid Goblin 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 Putrid Goblin
5. Resolve the Blasting Station trigger, untapping it
6. Resolve the Blasting Station ability from step 1
7. Repeat

Results

• Infinite creature ETB
• Infinite creature LTB
• Infinite damage
• Infinite death triggers
• Infinite creature sacrifice triggers