Dennis was able to prevent game ending damage and Shay did the same, using "Rank-Up-Magic Raid Force" to call out "Blaze Falcon" and nearly defeat Dennis
While limited in damage output due in part to its rarity restriction, it builds well for a long, arduous, and primarily defensive wars of attrition

Dragon Jungle King" #0556 "Empress Judge" #0557 "Little D" #0558 "Witch of the Black Forest" #0560 "Giant Scorpion of the Tundra" #0561 "Crow Goblin" #0562 "Leo Wizard" #0563 "Abyss Flower" #0564 "Patrol Robo" #0565 "Takuhee" #0566 "Dark Witch" #0567 "Weather Report" #0568 "Binding Chain" #0569 "Mechanical Snail" #0570 "Greenkappa" #0571 "Mon Larvas" #0572 "Living Vase" #0573 "Tentacle Plant" #0574 "Beaked Snake" #0575 "Morphing Jar" #0576 "Muse-A" #0578 "Rose Spectre of Dunn" #0579 "Fiend Reflection #1" #0580 "Ghoul with an Appetite" #0581 "Pale Beast" #0582 "Little Chimera" #0583 "Violent Rain" #0584 "Key Mace #2" #0585 "Tenderness" #0586 "Penguin Soldier" #0587 "Fairy Dragon" #0589 "Liquid Beast" #0590 "Twin Long Rods #2" #0591 "Great Bill" #0592 "Shining Friendship" #0593 "Bladefly" #0594 "Electric Lizard" #0595 "Hiro's Shadow Scout" #0596 "Lady of Faith" #0597 "Twin-Headed Thunder Dragon" #0598 "Hunter Spider" #0599 "Armored Starfish" #0600 "Hourglass of Courage" #0601 "Marine Beast" #0602 "Warrior of Tradition" #0603 "Rock Spirit" #0604 "Snakeyashi" #0605 "Succubus Knight" #0606 "Ill Witch" #0608 "High Tide Gyojin" #0609 "Fairy of the Fountain" #0610 "Amazon of the Seas" #0611 "Nekogal #2" #0612 "Witch's Apprentice" #0613 "Armored Rat" #0614 "Ancient Lizard Warrior" #0615 "Maiden of the Moonlight" #0616 "Stone Ogre Grotto" #0617 "Winged Egg of New Life" #0618 "Night Lizard" #0619 "Queen's Double" #0620 "Blue-Winged Crown" #0621 "Trent" #0622 "Queen of Autumn Leaves" #0623 "Amphibious Bugroth" #0624 "Acid Crawler" #0625 "Invader of the Throne" #0626 "Mystical Sheep #1" #0627 "Disk Magician" #0628 "Flame Viper" #0629 "Royal Guard" #0630 "Gruesome Goo" #0631 "Hyosube" #0632 "Machine Attacker" #0633 "Hibikime" #0634 "Whiptail Crow" #0635 "Magical Labyrinth" #0636 "Warrior Elimination" #0637 "Salamandra" #0638 "Eternal Rest" #0639 "Megamorph" #0640 "Stain Storm" #0641 "Eradicating Aerosol" #0642 "Breath of Light" #0643 "Eternal Draught" #0644 "Bright Castle" #0645 "Black Luster Ritual" #0646 "Zera Ritual" #0647 "Harpie's Feather Duster" #0648 "War-Lion Ritual" #0649 "Beastly Mirror Ritual" #0650 "Commencement Dance" #0651 "Hamburger Recipe" #0652 "Novox's Prayer" #0653 "House of Adhesive Tape" #0654 "Eatgaboon" #0655 "Widespread Ruin" #0656 "Goblin Fan" #0657 "Bad Reaction to Simochi" #0658 "Turtle Oath" #0659 "Resurrection of Chakra" #0660 "Javelin Beetle Pact" #0661 "Garma Sword Oath" #0662 "Revival of Dokurorider" #0663 "Fortress Whale's Oath" #0664 "Performance of Sword" #0665 "Hungry Burger" #0666 "Sengenjin" #0667 "Skull Guardian" #0668 "Tri-Horned Dragon" #0669 "Serpent Night Dragon" #0670 "Skull Knight" #0671 "Cosmo Queen" #0672 "Chakra" #0673 "Crab Turtle" #0674 "Mikazukinoyaiba" #0675 "Meteor Dragon" #0676 "Meteor B

You can only activate 1 "Dream Mirror Oneiromancy" per turn.
Every bit of text on this version of Mikaeus makes it a beast in a Zombie deck, so make sure you grab one
They don't go away as steps, phases, and turns end, and effects that add mana "of any type" can't give you energy counters