Activate Bloodthirsty Aerialist using Spike Feeder's second ability by removing a +1/+1 counter from it, causing you to gain 2 life.
Bloodthirsty Aerialist triggers, putting a +1/+1 counter on it.
Repeat.

Infinite lifegain

Infinite lifegain triggers

Agatha's Soul Cauldron

Spike Feeder

Bloodthirsty Aerialist

Activate Zur by paying {1}{W}, causing All Will Be One to become an enchantment creature.
Place a counter on a permanent or player.
All Will Be One triggers, dealing 1 damage to an opponent and causing you to gain 1 life.
Bloodthirsty Aerialist triggers, putting a +1/+1 counter on itself.
Repeat from step 3.

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