Cavalier of Night + Activated Sleeper + Phyrexian Altar

Prerequisites

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Steps

1. 1Activate Phyrexian Altar by sacrificing Cavalier of Night, adding one mana of any color.
2. 2When Cavalier of Night dies, it triggers, returning Activated Sleeper from your graveyard to the battlefield as a copy of Cavalier of Night.
3. 3When Activated Sleeper enters the battlefield, it triggers; choose not to sacrifice a creature.
4. 4Activate Phyrexian Altar by sacrificing Activated Sleeper, adding one mana of any color.
5. 5When Activated Sleeper dies, it triggers, returning Activated Sleeper from your graveyard to the battlefield as a copy of Cavalier of Night.
6. 6Repeat from step 3.

Effects

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