Grenzo, Dungeon Warden + Soldevi Digger + Su-Chi Cave Guard + Ashnod's Altar

Grenzo, Dungeon Warden

Soldevi Digger

Su-Chi Cave Guard

Ashnod's Altar

How it works

1. Activate Ashnod's Altar by sacrificing Su-Chi Cave Guard, adding CC.
2. When Su-Chi Cave Guard dies, it triggers, adding eight C.
3. Activate Soldevi Digger 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 revolves around sacrificing Su-Chi Cave Guard to Ashnod's Altar to generate colorless mana while triggering its death ability to yield a massive influx of eight more colorless mana. With your graveyard stocked, Soldevi Digger steps in to tuck the automaton right back onto the bottom of your library for a modest fee. From there, Grenzo, Dungeon Warden can easily cheat Su-Chi Cave Guard back onto the battlefield for just two mana, leaving you with a surplus of energy each cycle.