Grenzo, Dungeon Warden + Transplant Theorist + Su-Chi Cave Guard + Phyrexian Altar

Grenzo, Dungeon Warden

Transplant Theorist

Su-Chi Cave Guard

Phyrexian Altar

How it works

1. Activate Phyrexian Altar by sacrificing Su-Chi Cave Guard, adding one mana of any color.
2. When Su-Chi Cave Guard dies, it triggers, adding eight C.
3. Activate Transplant Theorist by paying 2, putting Su-Chi Cave Guard on the bottom of your library from your graveyard.
4. Activate Grenzo by paying 2, putting Su-Chi Cave Guard into your graveyard from the bottom of your library, and then putting it onto the battlefield.
5. Repeat.

This clever loop turns the mechanical harmony of the graveyard and library into an engine for infinite mana. You begin by feeding Su-Chi Cave Guard to Phyrexian Altar, whose sacrifice triggers the automaton to flood your pool with eight colorless mana alongside its standard color-producing reward. Transplant Theorist steps in to recycle that very same Su-Chi Cave Guard right back to the bottom of your library for a modest investment of two mana, thanks to its activated ability (while quietly letting you loot away any unwanted draws with its triggered ability whenever artifacts enter). From there, Grenzo, Dungeon Warden uses its activated ability to pluck Su-Chi Cave Guard straight from the bottom of your library and slide it right back onto the battlefield, letting you repeat the entire process to generate endless mana, deaths, and triggers.