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

Prerequisites

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Steps

1. 1Activate Arcbound Slith by paying , blinking it.
2. 2Arcbound Slith 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. 3Resolve Deadeye Navigator's trigger, repairing it and Arcbound Slith
4. 4Resolve The Ooze's trigger, creating a Mutagen token for each +1/+1 counter that was on Arcbound Slith when it left the battlefield.
5. 5Activate Urza's first ability twice by tapping Arcbound Slith and a Mutagen, adding .
6. 6Repeat.

Effects

• Infinite ETB
• Infinite LTB
• Infinite tapped Mutagen tokens