Dualcaster Mage + Corpse Dance + Carrion Feeder

Dualcaster Mage

Corpse Dance

Carrion Feeder

How it works

1. Cast Corpse Dance by paying its mana cost, targeting any applicable target.
2. Holding priority, cast Dualcaster Mage by paying its mana cost.
3. When Dualcaster Mage enters, it triggers, targeting Corpse Dance.
4. Holding priority, activate Carrion Feeder by sacrificing Dualcaster Mage.
5. Resolve the Dualcaster Mage trigger, copying Corpse Dance, with the copy targeting Dualcaster Mage
6. Resolve the Corpse Dance copy, returning Dualcaster Mage from your graveyard to the battlefield.
7. Repeat from step 3.

This clever loop turns the graveyard recursion of Corpse Dance into a self-sustaining engine by utilizing Dualcaster Mage's clever ability to copy spells upon entering the battlefield. When Dualcaster Mage enters and targets the original Corpse Dance, you can instantly sacrifice it to Carrion Feeder's activated ability, clearing the way for the copied spell to pull the Mage right back out of the graveyard with haste. Because Carrion Feeder conveniently provides a free sacrifice outlet while growing with endless +1/+1 counters, you can repeat this process indefinitely to churn through infinite sacrifice, death, and enter-the-battlefield triggers.