Tap Necrotic Ooze using Devoted Druid's ability to add {G}.
Untap Necrotic Ooze using Devoted Druid's ability, giving it a -1/-1 counter.
Tap Necrotic Ooze and remove a -1/-1 counter use Channeler Initiate's ability to add {1} of any color.
Repeat for infinite mana.

Infinite colored mana

Necrotic Ooze

Devoted Druid

Channeler Initiate

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

Cinderhaze Wretch

Activate Experiment Kraj using Devoted Druid's second ability by putting a -1/-1 counter on Experiment Kraj, untapping Experiment Kraj.
Activate Experiment Kraj using Channeler Initiate's ability by tapping Experiment Kraj and removing a -1/-1 counter from it, adding one mana of any color.
Repeat.

Experiment Kraj

Cast Channeler Initiate by paying {1}{G}.
Channeler Initiate enters the battlefield with a vigilance counter, putting three -1/-1 counters on itself.
Activate Channeler Initiate by tapping and removing a -1/-1 counter from it, adding one mana of any color.
Activate Tayam by paying {3} and removing all counters from Channeler Initiate.
Holding priority, activate Ashnod's Altar by sacrificing Channeler Initiate, adding {C}{C}.
Resolve the Tayam ability, milling three cards and returning Channeler Initiate from your graveyard to the battlefield.
Repeat from step 2.

Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite creature sacrifice triggers

Infinite self-mill

Tayam, Luminous Enigma

Ashnod's Altar

Thousand-Year Elixir

Cast Channeler Initiate by paying {1}{G}.
Channeler Initiate enters the battlefield with a vigilance counter, putting three -1/-1 counters on itself.
Equip Lightning Grieves to Channeler Initiate by paying {0}.
Activate Channeler Initiate by tapping and removing a -1/-1 counter from it, adding one mana of any color.
Activate Tayam by paying {3} and removing all counters from Channeler Initiate.
Holding priority, activate Ashnod's Altar by sacrificing Channeler Initiate, adding {C}{C}.
Resolve the Tayam ability, milling three cards and returning Channeler Initiate from your graveyard to the battlefield.
Repeat from step 2.

Lightning Greaves

Activate Channeler Initiate by tapping and removing a -1/-1 counter from it, adding one mana of any color.
Activate Channeler Initiate by paying {1} and putting a -1/-1 counter on it, untapping it.
Obelisk Spider triggers, causing each opponent to lose 1 life and you to gain 1 life.
Repeat.

Infinite lifegain

Infinite lifegain triggers

Infinite lifeloss

Sinking Feeling

Obelisk Spider

Activate Channeler Initiate by tapping and removing a -1/-1 counter from it, adding one mana of any color.
Activate Channeler Initiate by paying {1} and putting a -1/-1 counter on it, untapping it.
Nest of Scarabs triggers, creating a 1/1 Insect creature token.
Repeat.

Infinite creature tokens

Nest of Scarabs

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

Barrenton Medic

Concordant Crossroads

Activate Experiment Kraj using Cinderhaze Wretch's second ability by putting a -1/-1 counter on Experiment Kraj, untapping Experiment Kraj.
Activate Experiment Kraj using Channeler Initiate's ability by tapping Experiment Kraj and removing a -1/-1 counter from it, adding one mana of any color.
Repeat.

Activate Tayam by paying {3} and removing three counters from Channeler Initiate.
Holding priority, activate Ashnod's Altar by sacrificing Channeler Initiate, adding {C}{C}.
Channeler Initiate dies, triggering Felisa, creating a 2/1 Inkling creature token.
Activate Ashnod's Altar by sacrificing the Inkling, adding {C}{C}.
Resolve the Tayam ability from step 1, causing you to mill three cards and return Channeler Initiate from your graveyard to the battlefield with three -1/-1 counters and a vigilance counter on it.
Repeat.

Infinite colorless mana

Felisa, Fang of Silverquill

Activate Experiment Kraj using Barrenton Medic's second ability by putting a -1/-1 counter on Experiment Kraj, untapping Experiment Kraj.
Activate Experiment Kraj using Channeler Initiate's ability by tapping Experiment Kraj and removing a -1/-1 counter from it, adding one mana of any color.
Repeat.

Combos with "Channeler Initiate"