It only works on Summons that do not start a chain, like Special Summons from the Extra Deck, and because of this it often cannot resolve until your opponent has already set up a way to counter it or can play around the floodgate effect
Each deck has 40 cards in the main deck and five in the extra deck
Whenever your creatures or walkers of the planes are targeted by a spell or an ability your foe controls
Theros Beyond Death Variants These are alternate versions of Theros Beyond Death cards as well as promos and fixed-deck products

A Little Chat Abigale, Poet Laureate Aboleth Spawn Absorbing Man Abyssal Harvester Activated Sleeper Adagia, Windswept Bastion Adventurous Eater Aethertow Agate Instigator Agrus Kos, Eternal Soldier Altar Ibn-La'Ahad Altered Ego Amphibian Downpour Amphin Mutineer Angel of Indemnity Angel of Sanctions Anhelo, the Painter Anikthea, Hand of Erebos Anointer Priest Applied Geometry Araumi of the Dead Tide Arboreal Alliance Arcane Artisan Arcane Heist Arcane Proxy Arcane Savant Ardyn, the Usurper Arna Kennerd, Skycaptain Artisan of Forms Ashad, the Lone Cyberman Ashling's Command Ashling, Flame Dancer Ashnod the Uncaring Assemble from Parts Assembly Hall Assimilation Aegis Astral Steel Audacious Swap Aurora Shifter Auton Soldier Aven Wind Guide Back from the Brink Banish into Fable Banshee of the Dread Choir Barkshell Blessing Baron Helmut Zemo Barroom Brawl Battle for Bretagard Battlemage's Bracers Beamsplitter Mage Belonging Benthic Anomaly Bifurcate Biowaste Blob Blade of Selves Blade of Shared Souls Blazing Firesinger Bloodforged Battle-Axe Bloodthirsty Adversary Blue Mage's Cane Blue Ribbon Blue Sun's Twilight Body Double Bramble Sovereign Brass Knuckles Brenard, Ginger Sculptor Briarblade Adept Brigid's Command Broodbirth Viper Brudiclad, Telchor Engineer Burn Trail

Instead, were going to explore which GX decks have been competitive across the past and present of Yu-Gi-Oh!, whether as a result of their sheer strength upon release or as a result of circumstances where later support and evolutions of the deck would have allowed it to compete at some point throughout the games history