Activate Aetherflux Resevoir by paying 50 life, targeting yourself, but instead preventing the damage and causing you to gain 51 life due to Purity.
Repeat an arbitrarily large number of times.
Activate Aetherflux Resevoir by paying 50 life, dealing 50 damage to any target.
Repeat step 3 as desired.

Infinite damage

Infinite lifegain

Infinite lifegain triggers

Aetherflux Reservoir

Purity

Honor Troll

Cause a creature to enter the battlefield under your control.
Healer of the Pride triggers, holding priority, activate Prize Pig by tapping it, adding {2}.
Resolve the Healer of the Pride trigger, causing you to gain 3 life due to Honor Troll.
Prize Pig and Trudge Garden trigger.
Resolve the Prize Pig trigger, putting three ribbon counters of Prize Pig, then removing all ribbon counters from Prize Pig and untapping it.
Resolve the Trudge Garden trigger, causing you to pay {2} to create a 4/4 Fungus Beast creature token.
Repeat from step 2.

Infinite creature tokens

Infinite creature ETB

Trudge Garden

Healer of the Pride

Prize Pig

Mana Reflection

Cause a creature to enter the battlefield under your control.
Healer of the Pride triggers, holding priority, activate Prize Pig by tapping it, adding {1}.
Leyline of Abundance triggers, adding {G}.
Resolve the Healer of the Pride trigger, causing you to gain 3 life due to Honor Troll.
Prize Pig and Trudge Garden trigger.
Resolve the Prize Pig trigger, putting three ribbon counters of Prize Pig, then removing all ribbon counters from Prize Pig and untapping it.
Resolve the Trudge Garden trigger, causing you to pay {2} to create a 4/4 Fungus Beast creature token.
Repeat from step 2.

Leyline of Abundance

Search Results