Draw a card.
Nadir Kraken triggers, causing you to pay {1} to put a +1/+1 counter on Nadir Kraken and create a 1/1 Tentacle creature token.
The Tentacle enters the battlefield, triggering Mentor of the Meek.
Holding priority, activate Ashnod's Altar by sacrificing the Tentacle, adding {C}{C}.
Resolve the Mentor of the Meek trigger, causing you to draw a card.
Repeat from step 2.

Infinite card draw

Infinite draw triggers

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

Near-infinite death triggers

Near-infinite creature ETB

Near-infinite creature LTB

Near-infinite creature sacrifice triggers

Nadir Kraken

Mentor of the Meek

Ashnod's Altar

Activate Words of Wilding.
The next time you would draw a card, create a 2/2 bear token.
Mentor of the Meek triggers.
Sacrifice the bear to Ashnod's Altar for {C}{C}.
Before Mentor of the Meek resolves, activate Words of Wilding, replacing your next draw with the creation of a 2/2 bear.
Repeat for infinite ETB and LTB.

Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite creature sacrifice triggers

Words of Wilding

Activate Words of Wilding.
The next time you would draw a card, create a 2/2 bear token.
Mana Echoes and Mentor of the Meek trigger.
Allow Mana Echoes to resolve first, adding {C} for each bear you control.
Before Mentor of the Meek resolves, activate Words of Wilding, replacing your next draw with the creation of a 2/2 bear.
Repeat for infinite bears and colorless mana.

Infinite colorless mana

Infinite creature tokens

Mana Echoes

During your cleanup step, discard cards down to your maximum hand size.
Cryptcaller Chariot triggers, creating a number of tapped 2/2 Zombie creature tokens equal to the number of cards you discarded.
When the Zombie(s) enter, Mentor of the Meek triggers that many times.
Holding priority, activate Ashnod's Altar by sacrificing a Zombie, adding {C}{C}.
Resolve the first Mentor of the Meek trigger, causing you to pay {1} to draw a card.
Resolve all remaining Mentor of the Meek triggers, as applicable, choosing not to pay.
As it's still your cleanup step, you will again discard cards down to your maximum hand size.
Repeat from step 2.

Combos with "Mentor of the Meek"