How can you create a combo with Xavier Sal, Infested Captain, Intruder Alarm, Sharp-Eyed Rookie?
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[START OF COMBO]This combo can be formed with Xavier Sal, Infested Captain, Intruder Alarm, Sharp-Eyed Rookie

Color identity: BGU
Mana cost: 
Steps:
  1. Activate Xavier Sal's first ability by tapping it and removing a counter from a permanent you control, creating a copy of another creature token with base power or toughness that is greater than Sharp-Eyed Rookie's power or toughness.
  2. When the Wolf token enters the battlefield, Intruder Alarm and Sharp-Eyed Rookie trigger.
  3. Resolve the Intruder Alarm trigger, untapping all creatures.
  4. Resolve the Sharp-Eyed Rookie trigger, putting a +1/+1 counter on it and creating a Clue artifact token.
  5. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite Clue tokens
  - Infinite creature tokens
  - 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
  - You control a creature token that has base power or toughness that is greater than Sharp-Eyed Rookie's power or toughness.
  - You control a permanent that has a counter on it.
[END OF COMBO PREREQUISITES]
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