How can you create a combo with Mana Echoes, Shrieking Drake, Stonework Packbeast?
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[START OF COMBO]This combo can be formed with Mana Echoes, Shrieking Drake, Stonework Packbeast

Color identity: UR
Mana cost: {U}
Steps:
  1. Cast Shrieking Drake by paying {U}.
  2. When Shrieking Drake enters the battlefield, it triggers itself and Mana Echoes.
  3. Resolve the Mana Echoes ability, adding at least {C}{C}{C}.
  4. Resolve Shrieking Drake's ability, returning it from the battlefield to your hand.
  5. Activate Stonework Packbeast by paying {2}, adding {U}.
  6. Repeat any number of times.
  7. Once you have infinite colorless mana, you may activate Stonework Packbeast any number of times.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite colorless mana
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Mana Echoes must be on the battlefield
  - Shrieking Drake must be in your hand
  - Stonework Packbeast must be on the battlefield
  - You control at least two Drake creatures.
[END OF COMBO PREREQUISITES]
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