How can you create a combo with Elemental Mastery, Cathars' Crusade, Barrenton Medic?
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[START OF COMBO]This combo can be formed with Elemental Mastery, Cathars' Crusade, Barrenton Medic

Color identity: RW
Mana cost: 
Steps:
  1. Activate Barrenton Medic by tapping it, creating at least one 1/1 Elemental creature tokens with haste.
  2. When the Elemental enters the battlefield, Cathars' Crusade triggers, putting a +1/+1 counter on each creature you control.
  3. Activate Barrenton Medic by putting a -1/-1 counter on it, untapping it.
  4. Repeat.
  5. If Barrenton Medic has a power of two or greater, it will also get infinite +1/+1 counters.[END OF COMBO STEPS]

Result:
  - Infinite +1/+1 counters
  - Infinite creature tokens with haste
  - Infinite enters the battlefield[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Elemental Mastery attached to Barrenton Medic.
  - Barrenton Medic does not have summoning sickness, and has a power of one or greater.
[END OF COMBO PREREQUISITES]
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