Lurking Roper + Elemental Mastery + Angelic Chorus

Lurking Roper

Elemental Mastery

Angelic Chorus

How it works

1. Activate Lurking Roper by tapping it, creating four 1/1 Elemental creature tokens.
2. When the Elementals enter the battlefield, they trigger Angelic Chorus four times.
3. Resolve the first Angelic Chorus trigger, causing you to gain one life.
4. Lurking Roper triggers, untapping itself.
5. Repeat.