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

Urza, Lord High Artificer

Deadeye Navigator

The Ooze

Arcbound Mouser

How it works

1. Activate Arcbound Mouser by paying 1, 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
4. Resolve The Ooze's trigger, creating a Mutagen token for each +1/+1 counter that was on Arcbound Mouser when it left the battlefield.
5. Activate Urza's first ability twice by tapping Arcbound Mouser and a Mutagen, adding .
6. Repeat.