Phyrexian Altar, Dualcaster Mage, and Stitch Together

Prerequisites

• Phyrexian Altar on the battlefield
• Dualcaster Mage in hand
• Stitch Together in hand
• available

Steps

1. Cast Stitch Together by paying its mana cost
2. Holding priority, cast Dualcaster Mage by paying its mana cost
3. When Dualcaster Mage enters, it triggers, targeting Stitch Together
4. Holding priority, activate Phyrexian Altar by sacrificing Dualcaster Mage, adding one mana of any color
5. Resolve the Dualcaster Mage trigger, copying Stitch Together Resolve the Stitch Together copy, returning Dualcaster Mage from your graveyard to the battlefield
6. Repeat from step 3

Results

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