Agatha's Soul Cauldron + Lurking Roper + Soulmender

Agatha's Soul Cauldron

Lurking Roper

Soulmender

How it works

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

By feeding Soulmender to Agatha's Soul Cauldron, you imbue your creatures with its life-gaining tap ability, which Lurking Roper can then immediately adopt. Because Lurking Roper untaps every time you gain life, activating its newly acquired Soulmender ability creates a self-sustaining loop. The passive mana-fixing and counter-granting of Agatha's Soul Cauldron ties this all together, allowing you to continually tap and untap Lurking Roper to generate infinite life and trigger any associated payoffs endlessly.