Improvised Arsenal, Mana Echoes, Energy Refractor, and Barret, Avalanche Leader

Prerequisites

• Improvised Arsenal on the battlefield
• Mana Echoes on the battlefield
• Energy Refractor on the battlefield
• Barret, Avalanche Leader on the battlefield
• at most available

Steps

1. Activate Improvised Arsenal by paying , creating a token copy of it
2. Barret triggers, creating a creature token
3. When the creature token enters, Mana Echoes triggers, adding for each creature you control that shares a creature type with the creature token
4. If needed, activate Energy Refractor by paying , adding
5. Repeat

Results

• Infinite ETB
• Infinite colored mana
• Infinite colorless mana
• Infinite creature tokens that are infinitely powerful
• Infinitely powerful creatures you control