Trusty Boomerang, Mana Echoes, Tyvar, Jubilant Brawler, and Chishiro, the Shattered Blade

Prerequisites

• Trusty Boomerang in hand
• Mana Echoes on the battlefield
• Tyvar, Jubilant Brawler on the battlefield
• Chishiro, the Shattered Blade on the battlefield
• at most available

Steps

1. Cast Trusty Boomerang by paying
2. When Trusty Boomerang enters, Chishiro's triggers, creating a 2/2 Spirit creature token
3. When the Spirit enters, Mana Echoes triggers, adding for each Spirit you control
4. Activate Trusty Boomerang's equip ability by paying , attaching it to the Spirit token
5. Activate the Spirit by paying and tapping it, tapping a creature and returning Trusty Boomerang from the battlefield to your hand
6. Repeat

Results

• Infinite ETB
• Infinite colorless mana
• Infinite storm count
• Infinite tapped creature tokens