Voltaic Construct + Phyrexian Scriptures + Rainveil Rejuvenator

Voltaic Construct

Phyrexian Scriptures

Rainveil Rejuvenator

How it works

1. Cause Rainveil Rejuvenator to become an artifact using Phyrexian Scriptures.
2. Activate Rainveil Rejuvenator by tapping it, adding at least .
3. Activate Voltaic Construct by paying 2, untapping Rainveil Rejuvenator.
4. Repeat from step 2.

This ingenious loop turns a modest druid into a boundless green engine by utilizing Phyrexian Scriptures's first chapter to permanently graft the artifact type onto Rainveil Rejuvenator. Once it's an artifact creature, Rainveil Rejuvenator's mana-producing tap ability scales with its power, yielding enough mana to easily pay the activation cost of Voltaic Construct. Voltaic Construct then untaps the modified Rainveil Rejuvenator, letting you repeat the process to generate infinite green mana and infinite untaps of your artifact creatures.