Suddenly a portal over earth opens up over earth, and my Gyarados Ship flies through with the rest of my Magikarp Fleet, starting a lengthy battle with your Rocket Troops. With your army distracted, believing me to be on the Gyarados Ship, I get to work with the greatest Magikarp Magicians from twenty-nine thousand realities, each handpicked for their individual skills. I quickly get past your anti-teleportation spells. Meanwhile, my Magikarp Fleet finish up dealing with your Rocket Troops
My Fleet completely blockades your planet, and after bombardments from my cannons fail, I gather a force of my Magikarp infiltrators. Portals over up and my Magikarp Army, drafted from many galaxy-spanning Magikarp Empires in dimensions beyond our own, fall through your atmosphere, distracting your guards. Since your guards wear "the heaviest of armours," it isn't hard for my lighter, more agile Magikarp to outmanoeuvre them and knock them over. After weeks of searching, we find your Bank.
My infiltration team enters swimming through your water moat into the filtrations system of your Bank, and are able to take control of the devices controlling the waterways. Now your troops are cornered with no water supply, even if this mission fails, it won't take long for the fortress to fall. (I would like to take this time to ask how you constructed a moat on a planet made 99% of gas)
But we push on, disarming traps and taking out your guards. Eventually we reach the large metal door, and quickly manage to hack the system. Opening up the door, we are treated with layers upon layers of easy-to-break materials. Concrete? Smashed away by the Magikarp-Hulk. Metal? Melted away with our Firebreathing Dragon Magikarp. Glass? A mixture of both. I stare incredulously at the Obsidian for a moment. Seriously, it's hard, but it's not as hard as Minecraft would have you believe. Magikarp-Hulk smashes it easily.
Now I enter the final vault room, when the lasers spring to life. Dragon-Magikarp and Magikarp-Hulk, along with most of the rest of my Infiltration Team are fried instantly. No issue, I have infinite universes to go through. Me, and the five remaining members, avoid the lasers and reach the briefcase.
Your guards enter, and gun down the remaining five Magikarp with ease. Suddenly I'm surrounded. They fire into me until I'm nearly dead, and keep going. Only to look up and see the Briefcase gone, and a portal closing. My clone winks at you as it's dying, and I take the Briefcase back to my Magikarp Throne Room in the Magikarp Dimension. I have a statue built for the Infiltration Team, and especially my clone, as I prepare for your inevitable counterattack.