How can you create a combo with Krenko, Mob Boss, Umbral Mantle, Phyrexian Altar?
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[START OF COMBO]This combo can be formed with Krenko, Mob Boss, Umbral Mantle, Phyrexian Altar

Color identity: R
Mana cost: 
Steps:
  1. Activate Krenko by tapping it, creating at least three 1/1 Goblin creature tokens.
  2. Activate Phyrexian Altar three times by sacrificing three Goblins, adding {3}.
  3. Activate Krenko by paying {3} and untapping it, giving it +2/+2 until end of turn.
  4. Repeat.
  5. If you control four or more Goblins as this combo begins, this combo nets infinite mana.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite creature tokens
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinitely large Krenko until end of turn
  - Infinite sacrifice triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - You control at least two additional Goblins.
  - Krenko does not have summoning sickness.
  - Umbral Mantle attached to Krenko.
[END OF COMBO PREREQUISITES]
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