How can you create a combo with Alena, Kessig Trapper, Threaten, Reiterate?
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[START OF COMBO]This combo can be formed with Alena, Kessig Trapper, Threaten, Reiterate

Color identity: R
Mana cost: {2}{R}
Steps:
  1. Cast Threaten by paying {2}{R}, targeting Alena.
  2. Holding priority, activate Alena by tapping it, adding at least seven {R}.
  3. Cast Reiterate with buyback by paying {4}{R}{R}, creating a copy of Threaten targeting Alena and returning Reiterate to your hand.
  4. Resolve the Threaten copy, untapping Alena and giving it haste until end of turn.
  5. Repeat from step 2.
  6. Once you have a large amount of {R}, you may target opponent' creatures with the Threaten copies to take control of them.[END OF COMBO STEPS]

Result:
  - Gain control of all opponents' creatures until end of turn
  - Infinite magecraft triggers
  - Infinite mana creatures you control can produce
  - Infinite red mana
  - Infinite storm count
  - Infinite untap of creatures you control[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Alena, Kessig Trapper must be on the battlefield
  - Threaten must be in your hand
  - Reiterate must be in your hand
  - You control a creature with power seven or greater that has entered the battlefield this turn.
  - Alena does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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