How can you create a combo with Mana Echoes, Phyrexian Altar, Lab Rats?
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[START OF COMBO]This combo can be formed with Mana Echoes, Phyrexian Altar, Lab Rats

Color identity: BR
Mana cost: {4}{B}
Steps:
  1. Cast Lab Rats with buyback by paying {4}{B}, creating a 1/1 Rat creature token and returning Lab Rats to your hand.
  2. When the Rat enters the battlefield, Mana Echoes trigger, adding {C} for each Rat you control.
  3. Activate Phyrexian Altar by sacrificing the Rat, adding {B}.
  4. Repeat.
  5. If you control four or more Rats as the combo begins, this combo nets infinite colorless mana.[END OF COMBO STEPS]

Result:
  - Infinite colorless mana
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite magecraft triggers
  - Infinite sacrifice triggers
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Mana Echoes must be on the battlefield
  - Phyrexian Altar must be on the battlefield
  - Lab Rats must be in your hand
  - You control at least three Rats.
[END OF COMBO PREREQUISITES]
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