Activate Altar of Dementia 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, Captain Kathryn Janeway triggers, putting a +1/+1 counter on that creature.
Resolve the Altar of Dementia ability.
Repeat

Infinite creature ETB

Infinite creature LTB

Infinite death triggers

Infinite mill

Infinite creature sacrifice triggers

Infinite self-mill

Persist Creature

Altar of Dementia

Captain Kathryn Janeway

Play Glacial Chasm either from your hand or from your graveyard.
When Glacial Chasm enters the battlefield, its second ability triggers, causing you to sacrifice another land you control.
Play any land from your graveyard.
At the beginning of your next upkeep, Glacial Chasm's cumulative upkeep ability triggers, allowing you to choose not to pay the cost and sacrifice it instead.
Repeat.

Lock

Prevent all damage that would be dealt to you

Glacial Chasm

Mole Man, Moloid Master

Activate Shilgengar by sacrificing Captain Kathryn Janeway.
When Captain Kathryn Janeway dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
When Captain Kathryn Janeway enters, it triggers, revealing the top card of your library, putting the card back on top of your library, and then putting a +1/+1 counter on Captain Kathryn Janeway.
Resolve the Shilgengar ability.
Repeat.

Infinite Blood tokens

Infinite artifact tokens

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

Shilgengar, Sire of Famine

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, Captain Kathryn Janeway trigger, revealing the top card of your library, putting the card back on top of your library, and then putting a +1/+1 counter on Mister Gutsy
Repeat.

Mister Gutsy

Nim Deathmantle

Krark-Clan Ironworks

Cast Basking Broodscale by paying {1}{G}.
When Basking Broodscale enters, Captain Kathryn Janeway 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, Captain Kathryn Janeway 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

Infinite colorless mana

Basking Broodscale

Resourceful Defense

Activate Tooth and Claw by sacrificing two other creatures.
When the creatures die, One with the Kami triggers for each modified creature that died this way, creating a number of 1/1 Spirit creature tokens.
When the Spirit token(s) enter, Captain Kathryn Janeway triggers that many times, revealing the top card of your library, putting the card back on top of your library, and then putting a +1/+1 counter on each Spirit.
Resolve the Tooth and Claw ability, creating a 3/1 Carnivore creature token.
When the Carnivore token enters, Captain Kathryn Janeway triggers, revealing the top card of your library, putting the card back on top of your library, and then putting a +1/+1 counter on the Carnivore token
Repeat.

Infinite creature tokens

Tooth and Claw

One with the Kami

Activate Sling-Gang Lieutenant by sacrificing Putrid Goblin
When Putrid Goblin dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
When Putrid Goblin enters, Captain Kathryn Janeway triggers, revealing the top card of your library, putting a +1/+1 counter on Putrid Goblin and then putting the card back on top of your library.
Resolve the Sling-Gang Lieutenant ability.
Repeat.

Infinite lifegain

Infinite lifegain triggers

Infinite lifeloss

Putrid Goblin

Sling-Gang Lieutenant

Cast Dargo from the command zone by paying {R}.
When Dargo enters the battlefield, Captain Kathryn Janeway 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 colored 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 Captain Kathryn Janeway trigger.
Resolve the Captain Kathryn Janeway trigger, revealing the top card of your library, then putting it back and 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 "Captain Kathryn Janeway"