Cloak may not be a huge hit, but I think it plays well
Common methods to get the seed are to look at the current time in small fractions of a second, listen to atmospheric noise, measure the time between keystrokes, or measure internal voltage differences in the computer
Id consider using Pramikon in the same fashion as the second Sevinne option, making attacking troublesome
It's trivially easy to get it into your graveyard: that puts an Artifact into the graveyard, handy for turning on a Dragon Rage Channeller's Delirium ability or pumping up a 'Goyf, and providing another card
What makes this Battle truly worth it is if you can utilize the Kraken tokens for something bigger, which is exactly what Indomitable Creativity decks can do
This is yet another Wizard providing you some crucial synergies