Koll, the Forgemaster, Phyrexian Altar, Obsidian Battle-Axe, and Goblin Fireslinger

Prerequisites

• Koll, the Forgemaster on the battlefield
• Phyrexian Altar on the battlefield
• Obsidian Battle-Axe on the battlefield
• Goblin Fireslinger in hand
• Your life total is greater than an opponent's
• available

Steps

1. Cast Goblin Fireslinger by paying
2. Goblin Fireslinger enters the battlefield, triggering Obsidian Battle-Axe, attaching it to Goblin Fireslinger and giving it haste
3. Activate Goblin Fireslinger by tapping it, dealing 1 damage to target player
4. Activate Phyrexian Altar by sacrificing Goblin Fireslinger, adding
5. Koll triggers, returning Goblin Fireslinger from your graveyard to your hand
6. Repeat

Results

• Infinite damage
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite storm count