Imduk the World Chalice Dragon can overcome any monster your opponent controls thanks to its effect that allows it to destroy a monster it enters battle with at the start of the Damage Step
The act of courage inspires a change of heart in Joey, and he spends the rest of the series as Yugis fiercest friend and defender, and a pretty killer Duel Monsters player himselfmost notably, his deck contains the famed Red Eyes Black Dragon card
Magical Meltdown adds a copy of Aleister The Invoker, Aleister The Invoker adds a copy of Invocation and from that copy of Invocation youre able to go into a wide swathe of Invoked fusions, including but not limited to: Invoked Elysium Invoked Mechaba Invoked Caliga Invoked Raidjin Invoked Cocytus The card that youll usually be making is Invoked Mechaba, a card that can negate any monster, spell, or trap effect as long as you have that type of card in your hand at any given time
Floodgates: Anti-Special Summon floodgates, like "Vanity's Ruler" and "The Last Warrior from Another Planet"
If it is negated you can still Summon/Set non-Aesirs
but unless you hit the bosses or something, it really doesn't do much
