Agatha of the Vile Cauldron + Umbral Mantle + Cryptolith Rite

Agatha of the Vile Cauldron

Umbral Mantle

Cryptolith Rite

How it works

1. Activate the creature with Umbral Mantle attached by tapping it, adding 1.
2. Activate the creature by paying 1 due to Agatha of the Vile Cauldron and untapping it, giving itself +2/+2 until end of turn.
3. Repeat.

This ingenious loop turns any creature into an exponential growth engine by combining mana production, cost reduction, and untapping. With Cryptolith Rite granting your creature the ability to tap for mana, Umbral Mantle provides the crucial untap-and-pump activation that normally costs {3}. However, Agatha of the Vile Cauldron steps in as the master alchemist, slashing that activation cost down to just {1} based on her power. Because the untap ability generates a permanent +2/+2 pump, Agatha's power increases with each iteration, making the synergy completely self-sustaining while netting you infinitely large proportions.