Urza, Lord High Artificer, Deadeye Navigator, The Ooze, and Arcbound Mouser

Prerequisites

• Urza, Lord High Artificer on the battlefield
• Deadeye Navigator on the battlefield
• The Ooze on the battlefield
• Arcbound Mouser on the battlefield
• available

Steps

1. Activate Arcbound Mouser by paying , blinking it
2. Arcbound Mouser leaves and reenters the battlefield, causing it to enter with a +1/+1 counter due to its modular ability, and triggering The Ooze and Deadeye Navigator's soulbond ability
3. Resolve Deadeye Navigator's trigger, repairing it and Arcbound Mouser Resolve The Ooze's trigger, creating a Mutagen token for each +1/+1 counter that was on Arcbound Mouser when it left the battlefield
4. Activate Urza's first ability twice by tapping Arcbound Mouser and a Mutagen, adding
5. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite tapped Mutagen tokens