Activate Sensei's Divining Top's second ability by tapping it, causing you to draw a card and put Sensei's Divining Top from the battlefield onto the top of your library.
Cast Sensei's Divining Top from the top of your library by paying 1 life.
When Sensei's Divining Top enters the battlefield, Leonin Elder triggers, causing you to gain 1 life.
Repeat.

Infinite card draw

Near-infinite storm count

Near-infinite lifegain triggers

Infinite draw triggers

Sensei's Divining Top

Leonin Elder

Bolas's Citadel

Cause an artifact to enter the battlefield under your control.
Leonin Elder triggers, causing you to gain 2 life due to Cleric Class.
Cleric Class triggers, putting a +1/+1 counter on Scurry Oak.
Scurry Oak triggers, creating a 1/1 Squirrel creature token and a Food artifact token.
When the Food enters the battlefield, Leonin Elder triggers, causing you to gain 2 life.
Repeat from step 3.
Once you have infinite Foods, you may sacrifice them to Peregrin Took's ability.

Infinite creature tokens

Infinite ETB

Infinite Food tokens

Infinite lifegain

Infinite lifegain triggers

Infinite +1/+1 counters on a creature

Peregrin Took

Scurry Oak

Cleric Class

Cause a permanent to enter the battlefield under your control, which enters as an artifact due to Mycosynth Lattice.
Leonin Elder triggers, causing you to gain 2 life due to Cleric Class.
Cleric Class triggers, putting a +1/+1 counter on Herd Baloth.
Herd Baloth triggers, creating a 4/4 Beast creature token that enters the battlefield as an artifact due to Mycosynth Lattice.
Repeat from step 2.

Infinite +1/+1 counters on Herd Baloth

Herd Baloth

Mycosynth Lattice

Cause a permanent to enter the battlefield under your control, which enters as an artifact due to Mycosynth Lattice.
Leonin Elder triggers, causing you to gain 2 life due to Cleric Class.
Cleric Class triggers, putting a +1/+1 counter on Scurry Oak.
Scurry Oak triggers, creating a 1/1 Squirrel creature token that enters the battlefield as an artifact due to Mycosynth Lattice.
Repeat from step 2.

Infinite +1/+1 counters on Scurry Oak

Archangel of Thune triggers, putting a +1/+1 counter on each creature you control.
Archangel of Thune triggers, putting a +1/+1 counter on Scurry Oak.
Scurry Oak triggers, creating an artifact creature token.
Leonin Elder triggers, causing you to gain 1 life.
Repeat from step 2.

Infinite tokens

Infinite +1/+1 counters

Archangel of Thune

Biotransference

Cause a nonland permanent to enter the battlefield under your control, which enters as an artifact due to Mycosynth Lattice.
Leonin Elder triggers, causing you to gain 2 life due to Cleric Class.
Cleric Class triggers, putting a +1/+1 counter on Herd Baloth.
Herd Baloth triggers, creating a 4/4 Beast creature token that enters the battlefield as an artifact due to Mycosynth Lattice.
Repeat from step 2.

Encroaching Mycosynth

Cause a nonland permanent to enter the battlefield under your control, which enters as an artifact due to Mycosynth Lattice.
Leonin Elder triggers, causing you to gain 2 life due to Cleric Class.
Cleric Class triggers, putting a +1/+1 counter on Scurry Oak.
Scurry Oak triggers, creating a 1/1 Squirrel creature token that enters the battlefield as an artifact due to Mycosynth Lattice.
Repeat from step 2.

Combos with "Leonin Elder"