Cast Basking Broodscale by paying {1}{G}, which enters with a +1/+1 counter on it due to Arwen.
Basking Broodscale triggers, creating a 0/1 Eldrazi Spawn creature token that enters with a +1/+1 counter on it due to Arwen.
Activate the Eldrazi Spawn by sacrificing it, adding {C}.
When the Eldrazi Spawn dies, Reluctant Role Model's second ability triggers, putting a +1/+1 counter on Basking Broodscale.
Repeat from step 2.

Infinite creature LTB

Infinite creature ETB

Infinite creature sacrifice triggers

Infinite death triggers

Infinite colorless mana

Infinite +1/+1 counters on a creature

Basking Broodscale

Arwen, Weaver of Hope

Reluctant Role Model

Cast Basking Broodscale by paying {1}{G}.
When Basking Broodscale enters with a +1/+1 counter on it due to Arwen, it triggers, creating a 0/1 Eldrazi Spawn creature token that'll also enter with a +1/+1 counter on it.
Activate the Eldrazi Spawn by sacrificing it, adding {C}.
When the Eldrazi Spawn dies, The Ooze triggers, creating a Mutagen token.
Activate the Mutagen by paying {1}, tapping and sacrificing it, putting a +1/+1 counter on Basking Broodscale.
Basking Broodscale triggers, creating a 0/1 Eldrazi Spawn creature token that'll enter with a +1/+1 counter on it.
Repeat from step 3.

Infinite artifact ETB

Infinite artifact LTB

Infinite artifact sacrifice triggers

The Ooze

Put a +1/+1 counter on Basking Broodscale.
Basking Broodscale triggers, creating a 0/1 Eldrazi Spawn creature token that enters with a +1/+1 counter on it due to Arwen.
Activate the Eldrazi Spawn by sacrificing it, adding {C}.
When the Eldrazi Spawn dies, Slurrk triggers, putting a +1/+1 counter on each creature you control that has a +1/+1 counter on it.
Repeat from step 2.

Infinite +1/+1 counters on certain creatures

Slurrk, All-Ingesting

Activate Sensei's Divining Top's second ability by tapping it, causing you to draw a card and put Sensei's Divining Top on top of your library from the battlefield.
Activate Ashnod's Altar by sacrificing a creature without flying, adding {C}{C}.
When the creature dies, Luminous Broodmoth triggers, returning the creature from your graveyard to the battlefield with a flying counter on it.
Cast Sensei's Divining Top from the top of your library by paying {1} and removing the flying counter from the creature sacrificed in step 2.
Repeat.

Infinite card draw

Near-infinite creature ETB

Infinite draw triggers

Near-infinite storm count

Near-infinite creature LTB

Near-infinite death triggers

Near-infinite creature sacrifice triggers

Near-infinite colorless mana

Falco Spara, Pactweaver

Sensei's Divining Top

Luminous Broodmoth

Ashnod's Altar

Cast Appa by paying {2}{W}{W}.
When Appa enters, its first ability triggers, exiling Wispweaver Angel with the ability to cast it later from exile.
Cast Wispweaver Angel from exile by paying {0} and tapping Appa and another creature you control.
Appa's second ability triggers, creating a 1/1 Ally creature token.
When Wispweaver Angel enters, it triggers, blinking Appa.
Repeat from step 2.

Infinite storm count

Infinite tapped creature tokens

Appa, Steadfast Guardian

Hoarding Broodlord

Wispweaver Angel

Draw a card.
Lyla 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, Doom Weaver's soulbond ability triggers, pairing Doom Weaver and the Eldrazi Spawn.
Activate the Eldrazi Spawn by sacrificing it, adding {C}.
When the Eldrazi Spawn dies, it triggers, causing you to draw a card.
Repeat from step 2.

Near-infinite +1/+1 counters on a creature

Lyla, Holographic Assistant

Doom Weaver

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