Shilgengar, Sire of Famine + Dualcaster Mage + Black Sun's Twilight

Shilgengar, Sire of Famine

Dualcaster Mage

Black Sun's Twilight

How it works

1. Cast Black Sun's Twilight by paying 5
2. Holding priority, cast Dualcaster Mage by paying its mana cost.
3. When Dualcaster Mage enters, it triggers, targeting Black Sun's Twilight.
4. Holding priority, activate Shilgengar by sacrificing Dualcaster Mage.
5. Resolve the Dualcaster Mage trigger, copying Black Sun's Twilight
6. Resolve the Black Sun's Twilight copy, returning Dualcaster Mage from your graveyard to the battlefield.
7. Repeat from step 3.

This clever loop centers around Shilgengar, Sire of Famine turning your sacrificial fodder into a literal river of Blood tokens. By casting Black Sun's Twilight with enough mana to fuel its secondary effect, you set the stage to repeatedly loop Dualcaster Mage from the graveyard by targeting the spell with its own entry trigger. Each iteration lets you sacrifice Dualcaster Mage to Shilgengar, Sire of Famine to generate the necessary Blood tokens before Black Sun's Twilight resolves and brings the Mage right back to do it all over again.