Phyrexian Altar + Insidious Roots + Cult Conscript

Phyrexian Altar

Insidious Roots

Cult Conscript

How it works

1. Activate Phyrexian Altar by sacrificing Cult Conscript, adding .
2. Activate Cult Conscript by paying 1, returning it from your graveyard to the battlefield.
3. Insidious Roots triggers, creating a creature token and putting a +1/+1 counter on each Plant you control.
4. Activate Phyrexian Altar by sacrificing the creature token, adding 1.
5. Repeat.

This clever loop centers on the recursive nature of Cult Conscript, which can continuously claw its way back from your graveyard to the battlefield whenever a non-Skeleton creature dies under your control. Phyrexian Altar acts as the engine's primary fuel source, happily accepting sacrifices to generate the exact mana needed while simultaneously satisfying the death requirement that enables Cult Conscript to return. Meanwhile, Insidious Roots watches these graveyard departures trigger its second ability to continuously churn out fresh Plant tokens and stack up +1/+1 counters. Even if those tokens don't immediately help pay for the Conscript's return, their text boxes are rewritten by Insidious Roots' first ability to tap for mana, ensuring your sacrifice loop runs smoothly and indefinitely.