TwoSix
Dirty, realism-hating munchkin powergamer
Assuming point buy, a human (or any other Dex/Int race) shouldn't have trouble getting a Dex 16/Int 16/Con 14 right off the bat. I don't know if it's a huge problem, but it's a little stronger for level 3 than for level 6 or 8.I'd probably shift it to 1/Long Rest/IntMod honestly.
For most Rogues, Int is a secondary or tertiary stat. For Soul Knifes it's almost certainly Secondary, but if they can get their Int to 16, having 3 misty step's per long rest doesn't seem unbalanced to me. I guess I'm assuming they're going to prioritize pumping Dex first still, so the earliest Int might get to 16 would be 8th level or so, but still.