Activate Viscera Seer by sacrificing Scrapyard Recombiner.
When Scrapyard Recombiner dies, its modular ability and persist ability trigger.
Resolve the modular trigger, putting Scrapyard Recombiner's +1/+1 counters on another artifact creature.
Resolve the persist trigger, returning Scrapyard Recombiner from your graveyard to the battlefield. It will not have a -1/-1 counter on it due to its modular ability.
Resolve the Viscera Seer ability.
Repeat.

Infinite artifact ETB

Infinite artifact LTB

Infinite artifact sacrifice triggers

Infinite creature LTB

Infinite creature ETB

Infinite creature sacrifice triggers

Infinite death triggers

Infinite scry 1

Infinite +1/+1 counters on certain creatures

Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight

Viscera Seer

Scrapyard Recombiner

Activate Scrapyard Recombiner by paying {1}{U}, blinking it.
Scrapyard Recombiner 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 Scrapyard Recombiner
Resolve The Ooze's trigger, creating a Mutagen token for each +1/+1 counter that was on Scrapyard Recombiner when it left the battlefield.
Activate Urza's first ability twice by tapping Scrapyard Recombiner and a Mutagen, adding {U}{U}.
Repeat.

Infinite artifact tokens

Cast all spells in your library

Exile your library

Infinite blinking

Infinite blue mana

Infinite creature tokens

Infinite +1/+1 counters on creatures you control

Infinite Mutagen tokens

Urza, Lord High Artificer

Deadeye Navigator

The Ooze

Activate Scrapyard Recombiner by tapping it and sacrificing Lesser Masticore.
When Lesser Masticore dies, its persist ability and Dross Scorpion trigger.
Resolve the Dross Scorpion trigger, untapping Scrapyard Recombiner.
Resolve the Lesser Masticore trigger, returning it from your graveyard to the battlefield with no -1/-1 counters on it due to Vizier of Remedies.
Resolve the Scrapyard Recombiner ability, causing you to search your library for a Construct card and put it into your hand.
Repeat.

Put a selection of creature cards from your library into your hand

Vizier of Remedies

Lesser Masticore

Dross Scorpion

Combos with "Scrapyard Recombiner"