How can you create a combo with Deathrender, Gravedigger, Eternal Witness, Phyrexian Altar?
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[START OF COMBO]This combo can be formed with Deathrender, Gravedigger, Eternal Witness, Phyrexian Altar

Color identity: BG
Mana cost: 
Steps:
  1. Activate Phyrexian Altar by sacrificing Eternal Witness, adding one mana of any color.
  2. Eternal Witness dies, triggering Deathrender, putting Gravedigger from your hand onto the battlefield and attaching Deathrender to it.
  3. Gravedigger enters the battlefield, returning Eternal Witness from your graveyard to your hand.
  4. Activate Phyrexian Altar by sacrificing Gravedigger, adding one mana of any color.
  5. Gravedigger dies, triggering Deathrender, putting Eternal Witness from your hand onto the battlefield and attaching Deathrender to it.
  6. Eternal Witness enters the battlefield, returning Gravedigger from your graveyard to your hand.
  7. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Deathrender must be on the battlefield
  - Gravedigger must be in your hand
  - Eternal Witness must be on the battlefield
  - Phyrexian Altar must be on the battlefield
  - Deathrender attached to Eternal Witness.
[END OF COMBO PREREQUISITES]
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