How can you create a combo with Lurking Roper, Elemental Mastery, Prosperous Innkeeper?
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[START OF COMBO]This combo can be formed with Lurking Roper, Elemental Mastery, Prosperous Innkeeper

Color identity: RG
Mana cost: 
Steps:
  1. Activate Lurking Roper by tapping it, creating four 1/1 Elemental creature tokens.
  2. When the Elementals enter the battlefield, Prosperous Innkeeper's second ability triggers four times.
  3. Resolve the first Prosperous Innkeeper trigger, causing you to gain 1 life.
  4. Lurking Roper triggers, untapping itself.
  5. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite creature tokens with haste
  - Infinite enters the battlefield
  - Infinite lifegain
  - Infinite lifegain triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Lurking Roper does not have summoning sickness.
  - Elemental Mastery attached to Lurking Roper.
[END OF COMBO PREREQUISITES]
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