Barrin, Master Wizard + Myr Battlesphere + Krark-Clan Ironworks + Panharmonicon

Barrin, Master Wizard

Myr Battlesphere

Krark-Clan Ironworks

Panharmonicon

How it works

1. Cast Myr Battlesphere by paying 7.
2. When Myr Battlesphere enters the battlefield, it triggers twice, creating eight 1/1 Myr artifact creature tokens.
3. Activate Krark-Clan Ironworks five times by sacrificing five Myrs, adding ten C.
4. Activate Barrin by paying 2 and sacrificing a Myr, returning Myr Battlesphere to your hand from the battlefield.
5. Repeat.

This loop turns an army of metallic constructs into a self-sustaining engine of creation and sacrifice, fueled by the amplification of Panharmonicon. When Myr Battlesphere hits the battlefield, Panharmonicon ensures its entry trigger fires twice to flood your board with eight Myr tokens instead of four. You can then feed those tokens into Krark-Clan Ironworks to generate a healthy reserve of colorless mana, which in turn finances Barrin, Master Wizard's ability to bounce the original Myr Battlesphere back to your hand for replay. Every iteration leaves you with a growing surplus of mana and tokens, making this an overwhelming storm of entries, deaths, and sacrifices.