How can you create a combo with Sun Titan, Karmic Guide, Animate Dead, Phyrexian Altar?
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[START OF COMBO]This combo can be formed with Sun Titan, Karmic Guide, Animate Dead, Phyrexian Altar

Color identity: WB
Mana cost: {4}{W}{W}
Steps:
  1. Cast Sun Titan.
  2. Sun Titan enters the battlefield, returning Animate Dead from your graveyard to the battlefield.
  3. With the Animate Dead trigger on the stack, Activate Phyrexian Altar, sacrificing Sun Titan to add a mana of any color.
  4. Resolve the Animate Dead trigger, causing it to become an Aura with "enchant creature put onto the battlefield with Animate Dead" and returning Karmic Guide from your graveyard to the battlefield.
  5. Animate Dead is put into your graveyard due to state based actions, as it cannot attach to a creature with protection from black.
  6. Animate Dead triggers, causing you to sacrifice Karmic Guide.
  7. Karmic Guide's enter the battlefield triggers.
  8. Resolve Karmic Guide's enter the battlefield trigger returning Sun Titan from your graveyard to the battlefield.
  9. Repeat from step 2.[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:
  - Sun Titan must be in your hand
  - Karmic Guide must be in the graveyard
  - Animate Dead must be in the graveyard
  - Phyrexian Altar must be on the battlefield
[END OF COMBO PREREQUISITES]
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