Deathrender + Gravedigger + Eternal Witness + Phyrexian Altar

Prerequisites

• Deathrender attached to Eternal Witness.

Steps

1. 1Activate Phyrexian Altar by sacrificing Eternal Witness, adding one mana of any color.
2. 2Eternal Witness dies, triggering Deathrender, putting Gravedigger from your hand onto the battlefield and attaching Deathrender to it.
3. 3Gravedigger enters the battlefield, returning Eternal Witness from your graveyard to your hand.
4. 4Activate Phyrexian Altar by sacrificing Gravedigger, adding one mana of any color.
5. 5Gravedigger dies, triggering Deathrender, putting Eternal Witness from your hand onto the battlefield and attaching Deathrender to it.
6. 6Eternal Witness enters the battlefield, returning Gravedigger from your graveyard to your hand.
7. 7Repeat.

Effects

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