Urza, Lord High Artificer + Deadeye Navigator + The Ooze + Zabaz, the Glimmerwasp

Urza, Lord High Artificer

Deadeye Navigator

The Ooze

Zabaz, the Glimmerwasp

How it works

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