How can you create a combo with Saheeli, the Sun's Brilliance, Intruder Alarm?
user
[START OF COMBO]This combo can be formed with Saheeli, the Sun's Brilliance, Intruder Alarm

Color identity: UR
Mana cost: 
Steps:
  1. Activate any number of creatures by tapping them, adding at least {U}{R}.
  2. Activate Saheeli by paying {U}{R} and tapping it, creating a token copy of another creature you control with haste.
  3. When the creature token enters the battlefield, Intruder Alarm triggers, untapping all creatures.
  4. Repeat.
  5. If creatures you control can tap to produce at least {1}{U}{R}, this combo nets infinite mana.[END OF COMBO STEPS]

Result:
  - Infinite copies of all other creatures you control with haste
  - Infinite creature tokens with haste
  - Infinite enters the battlefield
  - Infinite mana creatures you control can produce
  - Infinite untap of all creatures[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Saheeli does not have summoning sickness.
  - Creatures you control can tap to produce at least {U}{R}.
[END OF COMBO PREREQUISITES]
assistant