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
Therefore, everything we've done so far is actually slightly off because we have not been taking into account the probability that a hand is a mulligan (no basics in hand)
As soon as it hits the battlefield, it can start dealing damage and buffing itself, while also drawing you a good number of cards
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
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Unblockable-matters EDH decks are also good