Mortuary + Narcomoeba + Undercity Informer + Mana Echoes

Mortuary

Narcomoeba

Undercity Informer

Mana Echoes

How it works

1. Activate Undercity Informer by paying 1 and sacrificing Narcomoeba.
2. When Narcomoeba dies, Mortuary triggers, putting Narcomoeba on top of your library from your graveyard.
3. Resolve the Undercity Informer ability, causing you to put Narcomoeba into your graveyard from the top of your library.
4. Narcomoeba triggers, returning itself to the battlefield from your graveyard.
5. When Narcomoeba enters the battlefield, Mana Echoes triggers, adding at least C.
6. Repeat.
7. If you control at least one other Illusion, this combo will net infinite colorless mana.

This ingenious loop starts by using Undercity Informer to sacrifice Narcomoeba, sending it straight to the graveyard where Mortuary instantly catches it and places it right back on top of your library. From there, the Informer's mill effect scoops Narcomoeba right back out of your library, triggering its own ability to return directly to the battlefield. Every single time our beloved Horror re-enters, Mana Echoes watches it arrive and generously rewards you with a steadily growing pool of colorless mana, turning this self-contained graveyard dance into an infinite engine.