At the beginning of your end step, Atraxa triggers, putting an indestructible counter on Myojin.
Activate Myojin by removing an indestructible counter from it, putting five +1/+1 counters on Sage of Hours and the remaining three +1/+1 counters on any creature(s) you control.
Activate Sage of Hours by removing all +1/+1 counters from it, causing you to take an extra turn after this one.
Repeat each turn.

Infinite turns

Lock

Atraxa, Praetors' Voice

Myojin of Towering Might

Sage of Hours

Activate Tekuthal using Myojin of Towering Might's ability by removing an indestructible counter from it, putting six +1/+1 counters on Crystalline Crawler, and two +1/+1 counters on any creature you control.
Activate Crystalline Crawler's first ability three times by removing three +1/+1 counters from it, adding {3}.
Activate Tekuthal by paying {3} and removing three +1/+1 counters from Crystalline Crawler, putting an indestructible counter on it.
Repeat.

Infinite colored mana

Infinite +1/+1 counters on creatures you control

Agatha's Soul Cauldron

Tekuthal, Inquiry Dominus

Crystalline Crawler

Activate Tekuthal using Myojin of Towering Might's ability by removing an indestructible counter from it, putting five +1/+1 counters on Cryptic Trilobite, and three +1/+1 counters on any creature you control.
Activate Cryptic Trilobite's first ability twice by removing two +1/+1 counters from it, adding {C}{C}{C}{C} that can only be spent to activate abilities.
Activate Tekuthal by paying {3} and removing three +1/+1 counters from Cryptic Trilobite, putting an indestructible counter on it.
Repeat.

Infinite colored mana that can only be spent to activate abilities of creatures

Infinite colorless mana that can only be spent to activate abilities

Cryptic Trilobite

Activate Tekuthal using Myojin of Towering Might's ability by removing an indestructible counter from it, putting six +1/+1 counters on Workhorse, and two +1/+1 counters on any creature you control.
Activate Workhorse three times by removing three +1/+1 counters from it, adding {C}{C}{C}.
Activate Tekuthal by paying {3} and removing three +1/+1 counters from Workhorse, putting an indestructible counter on it.
Repeat.

Combos with "Myojin of Towering Might"