Activate Zombie Infestation by discarding two cards, creating a 2/2 Zombie creature token and a 1/1 Soldier creature token.
Activate Shilgengar twice by sacrificing the Zombie and Soldier.
When the Zombie and Soldier die, Tresserhorn's Lord triggers twice, causing you to draw two cards.
Resolve both Shilgengar abilities.
Repeat.
This intricate engine uses Shilgengar, Sire of Famine as its sacrificial altar, turning your creatures into valuable Blood tokens while Queen Allenal of Ruadach works behind the scenes to double your token generation by adding extra 1/1 Soldiers whenever your Zombies appear. Every time you sacrifice those newly created tokens to Shilgengar, Tresserhorn's Lord, Returned capitalizes on the carnage with its static draw ability, instantly refilling your hand with cards to feed right back into Zombie Infestation. By cycling through your deck to discard cards for more Zombies, you can keep the loop endlessly spinning, churning out near-infinite resources and tokens until you're ready to use Shilgengar's massive six-Blood reanimation ability to sweep your graveyard clean.