Barret, Avalanche Leader, Sword of the Meek, Extruder, and Quina, Qu Gourmet

Prerequisites

• Barret, Avalanche Leader on the battlefield
• Sword of the Meek in hand
• Extruder on the battlefield
• Quina, Qu Gourmet on the battlefield
• available

Steps

1. Cast Sword of the Meek by paying
2. When Sword of the Meek enters, Barret's first ability triggers
3. Holding priority, activate Extruder by sacrificing Sword of the Meek
4. Resolve the Barret trigger, creating a 2/2 Rebel creature token and a 1/1 Frog creature token due to Quina
5. When the Frog enters, Sword of the Meek triggers, returning itself from your graveyard to the battlefield attached to the Frog
6. Repeat from step 2

Results

• Infinite +1/+1 counters on creatures you control
• Infinite ETB
• Infinite creature tokens