K'rrik, Son of Yawgmoth + Aetherflux Reservoir + Mourning + Cloud Key

K'rrik, Son of Yawgmoth

Aetherflux Reservoir

Mourning

Cloud Key

How it works

1. Cast Mourning by paying 2 life, targeting K'rrik.
2. Aetherflux Reservoir and K'rrik trigger.
3. Resolve the K'rrik trigger, putting a +1/+1 counter on it.
4. Resolve the Aetherflux Reservoir trigger, causing you to gain an amount of life equal to your storm count.
5. Resolve Mourning, attaching it to K'rrik.
6. Activate Mourning by paying 2 life, returning it to your hand from the battlefield.
7. Repeat.
8. Once you have infinite life, you may use Aetherflux Reservoir's ability to deal infinite damage to any target(s).

This loop turns a simple enchantment into a lethal engine by leveraging K'rrik, Son of Yawgmoth to replace the mana cost of Mourning with life payments. With Cloud Key reducing the enchantment's cost and K'rrik providing both lifelink and physical stat growth through +1/+1 counters, casting and bouncing Mourning becomes an intensely profitable cycle. Every single iteration triggers Aetherflux Reservoir to generate more life than you spend, eventually leaving you with infinite life, a massive storm count, and the fuel to blast away any target with the Reservoir's 50-damage payload.