Dualcaster Mage, Persist, and Phyrexian Altar

Prerequisites

• Dualcaster Mage in hand
• Persist in hand
• Phyrexian Altar on the battlefield
• You have at least one nonlegendary creature card in your graveyard
• available

Steps

1. Cast Persist by paying , targeting any nonlegendary creature card in your graveyard
2. Holding priority, cast Dualcaster Mage by paying
3. Dualcaster Mage enters the battlefield, triggering its ability, targeting Persist
4. Activate Phyrexian Altar by sacrificing Dualcaster Mage, adding one mana of any color
5. Resolve the Dualcaster Mage trigger, copying Persist, targeting Dualcaster Mage
6. Resolve the copy of Persist, returning Dualcaster Mage from your graveyard to the battlefield with a -1/-1 counter on it
7. Repeat from step 3

Results

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