How can you create a combo with Kitsa, Otterball Elite, Great Train Heist?
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[START OF COMBO]This combo can be formed with Kitsa, Otterball Elite, Great Train Heist

Color identity: UR
Mana cost: {2}{R}{R} at least
Steps:
  1. Cast Great Train Heist by paying at least {2}{R}{R}, choosing its first mode and optionally its second and/or third modes.
  2. Kitsa's prowess ability triggers, giving it +1/+1 until end of turn.
  3. Holding priority, activate any number of creatures by tapping them, adding at least {2}.
  4. Activate Kitsa's second ability by paying {2} and tapping it, copying Great Train Heist.
  5. Resolve the copy of Great Train Heist, untapping all creatures you control and causing you to get an additional combat phase after this one if it is your combat phase, along with any other mode(s) that were chosen.
  6. Repeat from step 3.[END OF COMBO STEPS]

Result:
  - Infinite untap of creatures you control
  - Infinite mana creatures you control can produce
  - Infinite magecraft triggers
  - Infinite combat phases
  - Infinitely powerful creatures you control until end of turn[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Kitsa, Otterball Elite must be on the battlefield
  - Great Train Heist must be in your hand
  - Kitsa does not have summoning sickness.
  - Kitsa has power 2 or greater.
  - Creatures you control can tap to produce at least {2}.
[END OF COMBO PREREQUISITES]
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