Elemental Mastery + Lurking Roper + Prosperous Innkeeper

RG identity

Commander legal

The 3 combo pieces

What must be in place

Lurking Roper does not have summoning sickness.
Elemental Mastery attached to Lurking Roper.

How to execute it

  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.

What the combo produces