I am really sad that Koraidon is neglected and only gets a tool that reduces damage while Miraidon get's an item you can play 4 of that can accel energy
When you go to draw a card after milling your last card, youll win the game because of Laboratory Maniac being on the battlefield
Both cards also allow you to cheat out a Level 4 or lower Spirit monster (the former from the hand, the latter from the deck) to the field, and since its not normal summoned, can remain on the field and not return to the hand
In addition to that, it can even combo off with other cards in the deck, giving you a ton of advantage with just one use

Rising Carp Witchcrafter Vice-Madame Amorphactor Pain, the Imagination Dracoverlord Dogmatika Alba Zoa Drytron Meteonis Draconids Drytron Meteonis Quadrantis Herald of Perfection Herald of Ultimateness Megalith Phul Nekroz of Areadbhair Nekroz of Brionac Nekroz of Catastor Nekroz of Clausolas Nekroz of Decisive Armor Nekroz of Sophia Nekroz of Trishula Nekroz of Unicore Nekroz of Valkyrus White Knight of Dogmatika White Relic of Dogmatika Adamancipator Risen Dragite Adamancipator Rise Leonite Adamancipator Risen Raptite Arionpos, Serpent of the Ghoti Aromaseraphy Sweet Marjoram Askaan, the Bicorned Ghoti Baronne de Fleur Baxia, Brightness of the Yang Zing Black-Winged Assault Dragon Blackwing Boreastorm the Wicked Wind Buster Dragon Chaos Ruler, the Chaotic Magical Dragon Coral Dragon Crystron Phoenix Crystron Quariongandrax Denglong, First of the Yang Zing Draco Berserker of the Tenyi Dragunity Knight Areadbhair Dragunity Knight Ascalon Dragunity Knight Barcha Dragunity Knight Gae Dearg F.A

Skyship Plunderer, Thrummingbird, and Winding Constrictor combine with most of our Energy makers to help grow our resources, while +1/+1 counter-based cards like Reyhan, Fabrication Module, and Hadanas Climb work in tandem to make our Proliferate triggers more impactful