Elemental Mastery, Galvanic Juggernaut, and Spawning Pit

Prerequisites

• Elemental Mastery on the battlefield
• Galvanic Juggernaut on the battlefield
• Spawning Pit on the battlefield
• Elemental Mastery attached to Galvanic Juggernaut
• Galvanic Juggernaut does not have summoning sickness

Steps

1. Activate Galvanic Juggernaut by tapping it, creating five 1/1 Elemental creature tokens with haste
2. Activate Spawning Pit's first ability by sacrificing an Elemental
3. When the Elemental dies, Galvanic Juggernaut triggers, untapping Galvanic Juggernaut
4. Resolve the Spawning Pit ability, putting a charge counter on it
5. Repeat

Results

• Infinite charge counters on Spawning Pit
• Infinite creature tokens with haste
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers