Activate Viscera Seer by sacrificing the persist creature.
When the persist creature dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
When the persist creature enters, Rocksteady triggers, putting a +1/+1 counter on that creature.
Resolve the Viscera Seer ability.
Repeat

Infinite creature ETB

Infinite creature LTB

Infinite creature sacrifice triggers

Infinite death triggers

Infinite scry 1

Persist Creature

Viscera Seer

Rocksteady, Mutant Marauder

Cast Walking Ballista by paying {0}.
Walking Ballista enters and dies as a state-based action due to having 0 toughness.
Rocksteady triggers, putting a +1/+1 counter on Evolution Witness.
Evolution Witness triggers, returning Walking Ballista from your graveyard to your hand.
Repeat.

Infinite proliferate

Infinite storm count

Evolution Witness

Walking Ballista

Cast Murderous Redcap by paying {2}{B/R}{B/R}.
When Murderous Redcap enters the battlefield, it and Rocksteady trigger.
Resolve the Rocksteady trigger, putting a +1/+1 counter on Murderous Redcap.
Resolve the Murderous Redcap trigger, dealing an amount of damage to itself equal to its power.
Murderous Redcap dies as a state-based action due to having 0 toughness.
Murderous Redcap's persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
Repeat from step 2.

Murderous Redcap

Activate Krark-Clan Ironworks by sacrificing Mister Gutsy, adding {C}{C}.
When Mister Gutsy dies, its second ability and Nim Deathmantle trigger.
Resolve the Mister Gutsy trigger, creating a number of Junk tokens equal to the number of +1/+1 counters that were on it.
If you created a Junk token, activate Krark-Clan Ironworks by sacrificing a Junk, adding {C}{C}.
Resolve the Nim Deathmantle trigger, causing you to pay {4} to return Mister Gutsy from your graveyard to the battlefield, and attaching Nim Deathmantle to it.
When Mister Gutsy enters the battlefield, Rocksteady trigger, putting a +1/+1 counter on Mister Gutsy.
Repeat.

Mister Gutsy

Nim Deathmantle

Krark-Clan Ironworks

Cast Dargo from the command zone by paying {R}.
When Dargo enters the battlefield, Rocksteady triggers, putting a +1/+1 counter on Dargo.
Activate Dargo using Tinder Wall's ability by sacrificing it, adding {R}{R}
Choose to return Dargo from your graveyard to the command zone.
Repeat.

Infinite commander casts

Infinite red mana

Dargo, the Shipwrecker

Agatha's Soul Cauldron

Tinder Wall

Activate Yidaro's cycling ability by paying {1}{R} and discarding it.
Yidaro triggers, putting it from your graveyard onto the battlefield.
When Yidaro enters the battlefield, Rocksteady triggers, putting a +1/+1 counter on Yidaro.
Resolve the Yidaro cycling ability, causing you to draw a card.
Activate Yidaro using Grinning Ignus's ability by paying {1} and returning Yidaro from the battlefield to your hand, adding {C}{C}{R}.
Repeat.

Combos with "Rocksteady, Mutant Marauder"