Phyrexian Altar, Vincent's Limit Break, and Dualcaster Mage

Prerequisites

• Phyrexian Altar on the battlefield
• Vincent's Limit Break in hand
• Dualcaster Mage in hand
• available

Steps

1. Cast Vincent's Limit Break by paying its mana cost
2. Holding priority, cast Dualcaster Mage by paying its mana cost
3. When Dualcaster Mage enters, it triggers, copying Vincent's Limit Break, with the copy targeting Dualcaster Mage
4. Resolve the copy of Vincent's Limit Break
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

Results

• Infinite LTB
• Infinite ETB
• Infinite colored mana
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite magecraft triggers