Hogaak, Arisen Necropolis + Altar of Dementia + Gutter Grime + The Skullspore Nexus

Hogaak, Arisen Necropolis

Altar of Dementia

Gutter Grime

The Skullspore Nexus

How it works

1. Activate Altar of Dementia by sacrificing Hogaak.
2. When Hogaak dies, Gutter Grime and The Skullspore Nexus trigger, creating two creature tokens.
3. Resolve the Altar of Dementia ability, causing you to mill eight cards.
4. Cast Hogaak from your graveyard by exiling five cards from your graveyard and tapping two black and/or green creatures you control.
5. Repeat.

This loop thrives on Hogaak, Arisen Necropolis's ability to be cast directly from your graveyard using convoke and delve, completely bypassing mana costs while fueling itself with the cards you mill. You sacrifice Hogaak to Altar of Dementia to mill eight cards, stocking your graveyard with fuel for the next iteration. Meanwhile, Gutter Grime and The Skullspore Nexus capitalize on Hogaak's demise by spitting out ever-growing creature tokens; The Skullspore Nexus even doubles a creature's power if you need an astronomical mill or an immediate lethal threat. Because Hogaak requires no mana, you can infinitely recur it by tapping the very tokens those enchantments create and exiling the milled cards, grinding through your entire deck in a single continuous loop.