i saw someone run caryatid and thought the additional ramp would help, its also an extra blocker and its cheap, any card could work probably,
i didnt like drawing more than 1 kiora at a time since its a dead draw at that point.
im no expert tho so take it with some salt,
im also testing
the great henge in the sideboard since i felt like karn most of the time couldnt draw anything useful from there and it helps with card draw in the lategame which i felt could also be improved,
but no conclusions on that yet