Mikaeus, the Unhallowed + Cryptic Trilobite + Crovax, Ascendant Hero

Mikaeus, the Unhallowed

Cryptic Trilobite

Crovax, Ascendant Hero

How it works

1. Activate Cryptic Trilobite by removing a +1/+1 counter from it, adding CC that can only be spent to activate abilities.
2. Repeat step 1 until Cryptic Trilobite does not have any +1/+1 counters on it.
3. Cryptic Trilobite dies as a state-based action due to having 0 toughness.
4. Cryptic Trilobite's undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
5. Repeat.

This loop transforms Mikaeus, the Unhallowed into a brilliant engine of rebirth, granting Cryptic Trilobite the undying ability it needs to return to the battlefield whenever it perishes. As Cryptic Trilobite strips away its own +1/+1 counters to generate mana, its toughness drops to zero and sends it to the graveyard, only for Mikaeus to bring it right back with a fresh counter ready to be spent. Meanwhile, Crovax, Ascendant Hero sits safely on the board to keep your life total high and pump your creatures, ensuring the entire setup runs autonomously.