Voltaic Construct + Phyrexian Scriptures + Deathbloom Ritualist

Voltaic Construct

Phyrexian Scriptures

Deathbloom Ritualist

How it works

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

This loop turns your graveyard into a bottomless mana well by transforming Deathbloom Ritualist into an artifact creature with the first chapter of Phyrexian Scriptures. Once it is an artifact, Voltaic Construct can step in to untap it for a mere two mana. As long as your graveyard holds enough creature cards to generate three or more mana with each tap, Deathbloom Ritualist pays for its own untap while leaving a profit of colored mana behind.