Phyrexian Altar + Dualcaster Mage + Lively Dirge

Prerequisites

• There's a creature card in your graveyard with mana value 4 or less.

Steps

1. 1Cast Lively Dirge by paying plus an additional to select its second mode, targeting a card in your graveyard.
2. 2Holding priority, cast Dualcaster Mage by paying its mana cost.
3. 3When Dualcaster Mage enters, it triggers, targeting Lively Dirge.
4. 4Holding priority, activate Phyrexian Altar by sacrificing Dualcaster Mage.
5. 5Resolve the Dualcaster Mage trigger, copying Lively Dirge
6. 6Resolve the Lively Dirge copy, returning Dualcaster Mage from your graveyard to the battlefield.
7. 7Repeat from step 3.

Effects

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