Agatha's Soul Cauldron + Lurking Roper + Overgrown Arch

Agatha's Soul Cauldron

Lurking Roper

Overgrown Arch

How it works

1. Activate Lurking Roper using Overgrown Arch's first ability by tapping it, causing you to gain 1 life.
2. Lurking Roper triggers, untapping itself.
3. Repeat.

This clever engine transforms a humble wall into an endless fountain of life by uniting the graveyard-sifting power of Agatha's Soul Cauldron with the persistent defense of Overgrown Arch. First, use Agatha's Soul Cauldron to exile Overgrown Arch, granting its life-gaining tap ability to your creatures. With that activated ability now stamped onto Lurking Roper, tapping the Roper for life triggers its own passive ability to untap whenever you gain life. This creates a closed-loop cycle where Lurking Roper can repeatedly tap itself to gain life and immediately untap, generating infinite life and life-gain triggers without ever needing to untap during your normal untap step.