Declare Cheering Fanatic as an attacker. Choose "Sensei's Divining Top" when it triggers.
Activate Sensei's Divining Top by tapping it, causing you to draw a card and putting Sensei's Divining Top from the battlefield onto the top of your library.
Jace's Erasure triggers, causing you to mill Sensei's Divining Top.
When Sensei's Divining Top is milled, Grolnok triggers, exiling Sensei's Divining Top with a croak counter on it.
Cast Sensei's Divining Top from exile by paying {0}.
Repeat from step 2.

Infinite card draw

Infinite draw triggers

Near-infinite storm count

Grolnok, the Omnivore

Sensei's Divining Top

Jace's Erasure

Cheering Fanatic

Declare Cheering Fanatic as an attacker, triggering its ability. Choose to name "Tatterkite".
Cast Tatterkite from your graveyard by paying {2} due to Cheering Fanatic. It won't enter with a finality counter on it due to its static ability.
Activate Ashnod's Altar by sacrificing Tatterkite, adding {C}{C}
Repeat from step 2.

Infinite ETB

Infinite LTB

Infinite death triggers

Infinite sacrifice triggers

Infinite storm count

Leonardo, Sewer Samurai

Tatterkite

Ashnod's Altar

Declare Cheering Fanatic as an attacker, triggering its ability. Choose to name "Sensei's Divining Top".
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.
Cast Sensei's Divining Top by paying {0} and removing a counter from a creature you control.
The Thirteenth Doctor triggers, putting a +1/+1 counter on it.
Repeat from step 2

Falco Spara, Pactweaver

The Thirteenth Doctor

Combos with "Cheering Fanatic"