A 7/6 should have no issues picking off small-to-medium sized creatures, but Kogla sticks around to crush an artifact or enchantment on every attack as well
Plus, any self-respecting Dark Depths players will have a plan to recur their combo pieces (like Life from the Loam), so answering a single Marit Lage isn't likely to be enough
Curiously, at the same time, it seems that Jaws, Relentless Predator has been quietly putting in work
And we, as players, will be there to capitalise on the brokenness
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Unblockable-matters EDH decks are also good