Aetherflux Reservoir + Purity + Leyline of Hope

Aetherflux Reservoir

Purity

Leyline of Hope

How it works

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