Evolution Witness, Surge Conductor, Grim Monolith, and Megatog

Prerequisites

• Evolution Witness on the battlefield
• Surge Conductor on the battlefield
• Grim Monolith in hand
• Megatog on the battlefield
• available

Steps

1. Cast Grim Monolith by paying its mana cost
2. When Grim Monolith enters, Surge Conductor triggers
3. Holding priority, activate Grim Monolith by tapping it, adding
4. Activate Megatog by sacrificing Grim Monolith, giving Megatog +3/+3 until end of turn
5. Resolve the Surge Conductor trigger, causing you to proliferate, putting a +1/+1 counter on Evolution Witness
6. Evolution Witness triggers, returning Grim Monolith from your graveyard to your hand
7. Repeat

Results

• Infinite artifact ETB
• Infinite artifact LTB
• Infinite artifact sacrifice triggers
• Infinite colorless mana
• Infinite proliferate
• Infinite storm count
• Infinitely large creature until end of turn