Evolution Witness, Surge Conductor, Megatog, and Mox Amber

Prerequisites

• Evolution Witness on the battlefield
• Surge Conductor on the battlefield
• Megatog on the battlefield
• Mox Amber in hand

Steps

1. Cast Mox Amber by paying its mana cost
2. When Mox Amber enters, Surge Conductor triggers
3. Holding priority, activate Mox Amber by tapping it, adding one mana of any color among legendary creatures and planeswalkers you control
4. Activate Megatog by sacrificing Mox Amber, 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 Mox Amber from your graveyard to your hand
7. Repeat

Results

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