During your precombat main phase, activate Famished Paladin using Shu Farmer's ability by tapping it, causing you to gain 1 life.
Famished Paladin triggers, untapping itself.
Repeat.

Infinite lifegain

Infinite lifegain triggers

Agatha's Soul Cauldron

Famished Paladin

Shu Farmer

During your precombat main phase, activate Lurking Roper using Shu Farmer's ability by tapping it, causing you to gain 1 life.
Lurking Roper triggers, untapping itself.
Repeat.

Lurking Roper

Activate Shu Farmer by tapping it, causing you to gain life.
Archangel of Thune triggers, putting a +1/+1 counter on each creature you control.
Activate Crystalline Crawler ability by removing a +1/+1 counter from it, adding {U}.
Activate Pemmin's Aura's ability by paying {U}, untapping Shu Farmer.
Repeat.

Combos with "Shu Farmer"