Mortuary + Woe Strider + Memnite + Bolas's Citadel

Mortuary

Woe Strider

Memnite

Bolas's Citadel

How it works

1. Activate Woe Strider by sacrificing Memnite
2. When Memnite dies, Mortuary triggers, putting Memnite from your graveyard onto the top of your library.
3. Resolve the Woe Strider ability.
4. Cast Memnite from the top of your library by paying 0 life.
5. Repeat.

This looping engine turns a zero-cost artifact creature into an endless fuel source for your graveyard and library manipulation. By using Woe Strider to sacrifice Memnite, you trigger Mortuary to gently place Memnite right back on top of your library instead of letting it rest. Because Bolas's Citadel allows you to play spells directly from the top of your library, you can recast Memnite for zero mana (and zero life paid), instantly resetting the loop.