A repeating source of self-mill obviously has a higher potential impact than a one-off sorcery or ETB trigger
EDIT: Thoughts on Kindred Discovery or is it too difficult given it's not a may

Human Dancing Elf Dark Rabbit Dharma Cannon Dice Armadillo Double Snare Dragon's Gunfire Dragon's Rage Dungeon Worm Eldeen Emergency Provisions Emperor of the Land and Sea Exiled Force Frog the Jam Fungi of the Musk Ganigumo Garvas Giant Mech-Soldier Giganto Golgoil Great Mammoth of Goldfine Guardian of the Sea Harpie's Pet Dragon Ice Water Invader from Another Dimension Kaiser Dragon Kamakiriman Kanikabuto Kappa Avenger Kattapillar Korogashi Kuwagata Alpha Kwagar Hercules Laughing Flower Life Absorbing Machine Little D Lizard Soldier Magical Ghost Man-Eating Black Shark Mech Bass Mechaleon Millennium Golem Minomushi Warrior Monster Tamer Monstrous Bird Mystical Sand Neck Hunter Oscillo Hero Parrot Dragon Pendulum Machine Pot the Trick Pragtical Prisman Rainbow Marine Mermaid Ready for Intercepting Reinforcement of the Army Ring of Destruction Riryoku Rude Kaiser Saber Slasher Sea Kamen Sea King Dragon Shovel Crusher Skelengel Skelgon Skullbird Skull Knight #2 Sky Dragon Soul Hunter Spirit of the Mountain Stamping Destruction Stone D

I considered putting Sorry in the main body of the article, but it's basically, well, got a similar concept with a lot of the other Unglued blue cards
If this face-up card on the field would be destroyed, you can detach all of its Xyz Materials instead
The heroes have lost, and the only one who remains is Celes, who spends the rest of the game on a quest through a destroyed world to bring her allies back together