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Krackens, Leviathans, Serpents and other sea beasts
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This deck has an interesting premise but there are a few main flaws. Firstly Simic Sky Swallower costs green mana and your deck has none which would make it difficult to summon. Secondly, although you only have a black mana symbol occurrence rate of 6 this does not mean you should only have 5 black mana, this could prove problematic if you draw one of those creatures because then the chances of you also having black mana is very slim. The Third flaw that I find with this deck is that you have a lot of high mana cost creatures making your mana curve very lopsided this could be a serious problem in the early and mid game as you only have a 2/15 chance of getting any creatures out before at least turn 6 or 7. I suggest you add mana filters (like evolving wilds) to make sure you get enough of the right mana, you should add some forests or get rid of the Simic Sky Swallower entirely, and you should probably add more low cost creatures just to protect yourself until you can get your big creatures out.
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I also made a U/B deck based around Quest For Ula's Temple some time ago. Check it out for some ideas. I also had the problem of the deck being too slow (especially since it's a standard deck - limiting my options). The best way is to put lots of creature destruction and counterspells to slow your opponent down as well.
i just mulligan until I have Ula's temple and an island in my hand and it works pretty quickly from there but it could use some control