How can you create a combo with Kenrith, the Returned King, Phyrexian Altar, Mitotic Slime?
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[START OF COMBO]This combo can be formed with Kenrith, the Returned King, Phyrexian Altar, Mitotic Slime

Color identity: WUBRG
Mana cost: {4}{B}
Steps:
  1. Activate Kenrith's fifth ability by paying {4}{B}, returning Mitotic Slime to the battlefield from your graveyard.
  2. Activate Phyrexian Altar by sacrificing Mitotic Slime, adding {B}.
  3. When Mitotic Slime dies, it triggers, creating two 2/2 Ooze creature tokens.
  4. Activate Phyrexian Altar twice by sacrificing the two Ooze tokens, adding {2}.
  5. When the Oozes die, they trigger, creating four 1/1 Ooze creature tokens.
  6. Activate Phyrexian Altar twice by sacrificing two Ooze tokens, adding {2}.
  7. Repeat.
  8. Once you have infinite mana, you may use it to activate any of Kenrtih's other abilities.[END OF COMBO STEPS]

Result:
  - Infinite +1/+1 counters
  - Infinite card draw for any number of players
  - Infinite colored mana
  - Infinite creature tokens
  - Infinite death triggers
  - Infinite draw triggers for any number of players
  - Infinite enters the battlefield
  - Infinite lifegain
  - Infinite lifegain triggers
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers
  - Put all creature cards from all graveyards onto the battlefield under your control[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Kenrith, the Returned King must be on the battlefield
  - Phyrexian Altar must be on the battlefield
  - Mitotic Slime must be in the graveyard
[END OF COMBO PREREQUISITES]
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