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

Grenzo, Dungeon Warden

Transplant Theorist

Su-Chi Cave Guard

Altar of Dementia

How it works

1. Activate Altar of Dementia by sacrificing Su-Chi Cave Guard.
2. When Su-Chi Cave Guard dies, it triggers, adding eight C.
3. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Su-Chi Cave Guard's power.
4. Activate Transplant Theorist by paying 2, putting Su-Chi Cave Guard on the bottom of your library from your graveyard.
5. 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.
6. Repeat.

This loop relies on a clever recycling cycle fueled by Su-Chi Cave Guard, which generates a massive eight colorless mana whenever it dies to Altar of Dementia. That influx of mana easily pays to activate Transplant Theorist, returning the fallen construct from the graveyard to the bottom of your library. From there, Grenzo, Dungeon Warden can peer into the bottom of your library and cheat Su-Chi Cave Guard directly back onto the battlefield for a mere two mana, leaving you with plenty of leftover energy to repeat the cycle. Meanwhile, Transplant Theorist's ability smoothly filters your hand every time artifacts enter the fray, tying the engine together into an endless cascade of sacrifices, mill, and mana.