How can you create a combo with Xavier Sal, Infested Captain, Experiment Kraj, Devoted Druid, Vizier of Tumbling Sands?
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[START OF COMBO]This combo can be formed with Xavier Sal, Infested Captain, Experiment Kraj, Devoted Druid, Vizier of Tumbling Sands

Color identity: BGU
Mana cost: 
Steps:
  1. Activate Experiment Kraj using Devoted Druid's second ability by putting a -1/-1 counter on it, untapping it.
  2. Activate Xavier Sal's first ability by tapping it and removing a -1/-1 counter from Experiment Kraj, creating a copy of any creature token you control.
  3. Activate Experiment Kraj using Vizier of Tumbling Sands's ability by tapping it, untapping Xavier Sal.
  4. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite copies of creature tokens you control
  - Infinite creature tokens
  - Infinite enters the battlefield[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Experiment Kraj and Xavier Sal do not have summoning sickness.
  - Devoted Druid and Vizier of Tumbling Sands each have at least one +1/+1 counter on them.
  - You control at least one creature token.
[END OF COMBO PREREQUISITES]
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