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

Grenzo, Dungeon Warden

Transplant Theorist

Su-Chi

Phyrexian Altar

How it works

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

This clever engine uses Phyrexian Altar to sacrifice Su-Chi, generating a colorful mana while triggering Su-Chi's death ability to net a massive influx of colorless mana. Transplant Theorist steps in to recycle Su-Chi right back to the bottom of your library for a couple of mana, which in turn fuels Grenzo, Dungeon Warden to instantly cheat Su-Chi back onto the battlefield from the bottom of your library. Meanwhile, Transplant Theorist's static ability provides handy loot triggers whenever artifacts enter the fray, tying this recursive loop together into an infinite cascade of mana, sacrifices, and enters-the-battlefield effects.