Urza, Lord High Artificer + Deadeye Navigator + The Ooze + Arcbound Ravager
Urza, Lord High Artificer
Deadeye Navigator
The Ooze
Arcbound Ravager
Infinite artifact ETBInfinite artifact LTBInfinite artifact sacrifice triggersInfinite artifact tokensCast all spells in your libraryExile your libraryInfinite +1/+1 counters on creatures you controlInfinite Mutagen tokensInfinite blinkingInfinite blue manaInfinite creature tokensInfinite creature ETBInfinite creature LTB
How it works
Activate Arcbound Ravager by paying 1, blinking it.
Arcbound Ravager leaves and reenters the battlefield, causing it to enter with +1/+1 counters due to its modular ability, and triggering The Ooze and Deadeye Navigator's soulbond ability.
Resolve Deadeye Navigator's trigger, repairing it and Arcbound Ravager
Resolve The Ooze's trigger, creating a Mutagen token for each +1/+1 counter that was on Arcbound Ravager when it left the battlefield.
Activate Urza's first ability twice by tapping Arcbound Ravager and a Mutagen, adding .