Mortuary + Dross Harvester + Myr Scrapling + Gwenom, Remorseless

Mortuary

Dross Harvester

Myr Scrapling

Gwenom, Remorseless

How it works

1. Activate Myr Scrapling by sacrificing it.
2. When Myr Scrapling dies, Mortuary and Dross Harvester trigger.
3. Resolve the Mortuary trigger, putting Myr Scrapling from your graveyard onto the top of your library.
4. Resolve the Dross Harvester trigger, causing you to gain 2 life
5. Resolve the Myr Scrapling ability.
6. Cast Myr Scrapling from the top of your library by paying 1 life.
7. Repeat.

This clever loop turns a modest artifact construct into an infinite engine by leveraging Gwenom, Remorseless to bypass traditional mana costs entirely; as you cast Myr Scrapling from the top of your library, Gwenom lets you pay life instead of mana. Mortuary ensures that the sacrificed Myr Scrapling never stays in the graveyard, instantly cycling it back to the top of your library to keep the chain going. Meanwhile, Dross Harvester offsets the life payments of your alternative casting costs with a steady stream of life gain whenever the creature dies, buffering you against the drain.