Phyrexian Altar + Dualcaster Mage + Feign Death

Prerequisites

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Steps

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

Effects

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