Requires

Undercellar Myconid must be on the battlefield. Enduring Renewal must be on the battlefield. Phyrexian Altar must be on the battlefield. Mana needed:

Steps

1. Activate Phyrexian Altar by sacrificing Undercellar Myconid, adding .
2. Undercellar Myconid dies, triggering itself and Enduring Renewal.
3. Resolve the Undercellar Myconid trigger, creating a 1/1 Saproling creature token.
4. Resolve the Enduring Renewal trigger, returning Undercellar Myconid from your graveyard to your hand.
5. Activate Phyrexian Altar by sacrificing the Saproling token, adding .
6. Cast Undercellar Myconid by paying .
7. Undercellar Myconid enters the battlefield, creating a 1/1 Saproling creature token.
8. Activate Phyrexian Altar by sacrificing the Saproling token, adding .
9. Repeat.

Results