Activate Ashnod's Altar 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, Support Mission triggers, putting a +1/+1 counter on that creature.
Repeat

Infinite colorless mana

Infinite creature ETB

Infinite creature LTB

Infinite death triggers

Infinite creature sacrifice triggers

Persist Creature

Ashnod's Altar

Support Mission

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, Support Mission trigger, putting a +1/+1 counter on Mister Gutsy.
Repeat.

Exile your library with the ability to play the exiled cards until end of turn

Infinite Junk tokens

Infinite artifact ETB

Infinite artifact LTB

Infinite artifact sacrifice triggers

Infinite artifact tokens

Mister Gutsy

Nim Deathmantle

Krark-Clan Ironworks

Cast Basking Broodscale by paying {1}{G}.
When Basking Broodscale enters, Support Mission triggers, putting a +1/+1 counter on Basking Broodscale.
Basking Broodscale triggers, creating a 0/1 Eldrazi Spawn creature token.
When the Eldrazi Spawn enters, Support Mission triggers, putting a +1/+1 counter on the Eldrazi Spawn.
Activate the Eldrazi Spawn by sacrificing it, adding {C}.
When the Eldrazi Spawn dies, Resourceful Defense triggers, putting a +1/+1 counter on Basking Broodscale.
Repeat from step 3.

Infinite +1/+1 counters on a creature

Basking Broodscale

Resourceful Defense

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

Infinite commander casts

Infinite storm count

Infinite red mana

Dargo, the Shipwrecker

Agatha's Soul Cauldron

Reckless Barbarian

Cast Murderous Redcap by paying {2}{B/R}{B/R}.
When Murderous Redcap enters the battlefield, it and Support Mission trigger.
Resolve the Support Mission 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

Combos with "Support Mission"