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

Urza, Lord High Artificer

Deadeye Navigator

The Ooze

Arcbound Javelineer

How it works

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