Phyrexian Altar + Dualcaster Mage + Undying Malice

Phyrexian Altar

Dualcaster Mage

Undying Malice

How it works

1. Cast Undying Malice by paying its mana cost.
2. Holding priority, cast Dualcaster Mage by paying its mana cost.
3. When Dualcaster Mage enters, it triggers, copying Undying Malice, with the copy targeting Dualcaster Mage.
4. Resolve the copy of Undying Malice.
5. Holding priority, activate Phyrexian Altar by sacrificing Dualcaster Mage.
6. When Dualcaster Mage dies, it triggers, returning it from your graveyard to the battlefield.
7. Repeat from step 3.

This clever loop transforms a simple recursion spell into an engine for infinite resources. By targeting Dualcaster Mage with the Undying Malice copy it generates upon entry, you set up a permanent safety net that returns the Mage to the battlefield every time it leaves. Feeding that loop is Phyrexian Altar, which lets you instantly sacrifice the returning Dualcaster Mage to generate colored mana while simultaneously fueling the death and sacrifice triggers needed to keep the cycle spinning.