Place a -1/-1 counter on Necrotic Ooze with Devoted Druid's ability and remove it with Morselhoarder's ability to add one mana of any color.
Repeat

Infinite colored mana

Necrotic Ooze

Devoted Druid

Morselhoarder

Activate Morselhoarder by tapping it to create 1/1 green Elf Warrior token.
Activate Sinking Feeling, by paying {1} and putting a -1/-1 counter on Morselhoarder to untap it.
Activate Morselhoarder by removing a -1/-1 counter from it to add a mana of any color.
Repeat.

Infinite creature tokens

Infinite ETB

Sinking Feeling

Presence of Gond

Activate Necrotic Ooze by putting a -1/-1 counter on it, untapping it.
Activate Necrotic Ooze by removing a -1/-1 counter from it, adding one mana of any color.
Repeat.

Cinderhaze Wretch

Pay {1} to activate Volrath to make it a copy of Devoted Druid .
Tap and untap Volrath using Devoted Druid's ability four times, adding four {G} and four -1/-1 counters.
Pay {G} to activate Volrath ability targeting Morselhoarder.
Remove four -1/-1 counters from Volrath, adding four mana of any color.
Repeat.


Volrath, the Shapestealer

Activate Morselhoarder by tapping it to add a mana of any color.
Activate Sinking Feeling, by paying {1} and putting a -1/-1 counter on Morselhoarder to untap it.
Activate Morselhoarder by removing a -1/-1 counter from it to add a mana of any color.
Repeat.

Multani's Harmony

If Morselhoarder has any -1/-1 counters on it, activate it by removing a -1/-1 counter from it, adding one mana of any color.
Repeat step 1 as necessary until Morselhoarder has no -1/-1 counters on it.
Activate Viscera Seer by sacrificing Morselhoarder.
When Morselhoarder dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
Resolve the Viscera Seer ability.
Repeat.

Infinite LTB

Infinite sacrifice triggers

Infinite death triggers

Infinite scry 1

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

Viscera Seer

Activate Necrotic Ooze using Barrenton Medic's second ability by putting a -1/-1 counter on it, untapping it.
Activate Necrotic Ooze using Morselhoarder's ability by removing a -1/-1 counter from it, adding one mana of any color.
Repeat.

Barrenton Medic

Activate Xavier Sal's second ability by tapping it and sacrificing a creature.
When the creature dies, Xavier Sal triggers, untapping Xavier Sal.
Resolve the Xavier Sal ability from step 1, putting a +1/+1 counter on a creature you control and a -1/-1 counter on Morselhoarder
Animation Module triggers, holding priority, activate Morselhoarder by removing a -1/-1 counter from it, adding {1}.
Resolve the Animation Module trigger, causing you to pay {1} to create a 1/1 Servo artifact creature token.
Repeat.
Once you have infinite +1/+1 counters among creatures you control, you may instead use Xavier Sal's first ability to get infinite copies of creature tokens you control.

Infinite copies of creature tokens you control

Infinite proliferate

Xavier Sal, Infested Captain

Animation Module

Thornbite Staff

Activate Morselhorder by removing all -1/-1 counters from it, adding {B} for each counter removed.
Activate Wandering Mage's third ability by paying {B} and putting two -1/-1 counters on Morselhorder, preventing the next two damage dealt to you this turn.
Repeat.

Prevent all damage that would be dealt to you and creatures you control

Wandering Mage

Pir, Imaginative Rascal

Winding Constrictor

Doubling Season

Vorinclex, Monstrous Raider

Activate Morselhoarder by tapping it, dealing 1 damage to any target.
Activate Morselhoarder by paying {1} and putting a -1/-1 counter on it, untapping it.
Activate Morselhoarder by removing a -1/-1 counter from it, adding {1}.
Repeat.

Combos with "Morselhoarder"