Shilgengar, Sire of Famine + Solemnity + Phyrexian Altar

Shilgengar, Sire of Famine

Solemnity

Phyrexian Altar

How it works

1. Activate Shilgengar's first ability by sacrificing another nontoken creature, creating at least one Blood artifact token.
2. Repeat step 1 until you control at least six Blood tokens.
3. Activate Phyrexian Altar by sacrificing another nontoken creature, adding W/B.
4. Repeat step 3 until you have W/BW/BW/B available.
5. Activate Shilgengar by paying W/BW/BW/B and sacrificing six Blood tokens, returning all creature cards from your graveyard to the battlefield without a finality counter on them due to Solemnity.
6. Repeat.
7. If you control additional nontoken creatures, you may sacrifice them in step 1 to get infinite Blood tokens, and/or in step 3 to get infinite colored mana.

This sinister loop turns your graveyard into a revolving door by leveraging Shilgengar, Sire of Famine to sacrifice creatures for Blood tokens while Phyrexian Altar converts spare bodies into the necessary white or black mana. The true brilliance of the engine lies in Solemnity, whose passive static ability prevents counters from ever being placed, neatly bypassing the finality counters that would normally spell doom for the creatures Shilgengar brings back from the dead. With that restriction completely nullified, you can endlessly cycle your entire creature roster back to the battlefield, generating infinite death triggers, sacrifice value, and a mountain of Blood tokens along the way.