Remember, characters cant be exerted to sing on the same turn they are played (unless the card says otherwise)
There, they were forced to mine mythril

A Display of My Dark Power Adrenaline Jockey Ambiguity Angel's Feather Apothecary Initiate April O'Neil, Human Element Archnemesis Ash Zealot Astral Slide Aurelia, the Law Above Auspicious Ancestor Avatar Roku, Firebender Aven Shrine B-I-N-G-O Barbflare Gremlin Bazaar of Wonders Blind Creeper Blood Tyrant Bloodbond March Bog Gnarr Bog-Strider Ash Bonus Round Breena, the Demagogue Bubbling Muck Burning Earth Burning-Tree Shaman Cabal Shrine Carmen, Cruel Skymarcher Cemetery Gatekeeper Censorship Cephalid Shrine Chalice of the Void Chaos Moon Charitable Levy Checks and Balances Coal Hill School Combat Calligrapher Common Courtesy Confessor Crystal Rod Curse of Chaos Curse of Inertia Curse of Shallow Graves Curse of Wizardry Demon's Horn Desecration Elemental Dictate of Karametra Dovescape Dragon's Claw Dreamtide Whale Drooling Ogre Drowner Initiate Dwarven Shrine Ebon Drake Eidolon of the Great Revel Eloren Wilds Elvish Handservant Eye of the Storm False Cure Fields of Summer Fleeting Aven Forgotten Ancient Fumulus, the Infestation Geometric Nexus Glade Gnarr Glademuse Glimmervoid Basin Glowing One Golem's Heart Gonti, Night Minister Gutmorn, Pactbound Servant Heartbeat of Spring

Demilich looks to continue that trend
It is defeated when the last defense counter is removed from it
Whether it's Claude, GPT-4, or Gemini, pick whichever vision model you trust