How can you create a combo with Mikaeus, the Unhallowed, Cauldron of Souls, Dross Scorpion, Phyrexian Altar?
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[START OF COMBO]This combo can be formed with Mikaeus, the Unhallowed, Cauldron of Souls, Dross Scorpion, Phyrexian Altar

Color identity: B
Mana cost: 
Steps:
  1. Activate Cauldron of Souls by tapping it, giving Dross Scorpion persist until end of turn.
  2. Activate Phyrexian Altar by sacrificing Dross Scorpion, adding one mana of any color.
  3. Dross Scorpion dies, triggering its ability, its undying ability and its persist ability.
  4. Resolve the first Dross Scorpion trigger, untapping Cauldron of Souls.
  5. Resolve the Dross Scorpion persist trigger, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
  6. Activate Phyrexian Altar by sacrificing Dross Scorpion, adding one mana of any color.
  7. Dross Scorpion dies, triggering its ability and its undying ability.
  8. Resolve the first Dross Scorpion trigger, untapping Cauldron of Souls.
  9. Resolve the second Dross Scorpion trigger, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  10. Activate Phyrexian Altar by sacrificing Dross Scorpion, adding one mana of any color.
  11. Dross Scorpion dies, triggering its ability and its persist ability.
  12. Repeat from step 4.[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:
  - All permanants must be on the battlefield
[END OF COMBO PREREQUISITES]
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