In my opinion, it isn't the magic damage the item gives the person using it, as it was used before the update. What really happened was sated devourer became a huge power spike because every other aa applied 2 on hit effects (so 2 botrk passives and 2 passives from the item itself, which the item would take 50 stacks before to do the same amount of dps). Other passives/abilities also applied on the aa like yi's true damage, kayle's passive, and shyvana's e making their damage through the roof with just 2 items, and only need 5k at 20 minutes and a bit of farm. Even if the lanes loose by a little, what can anyone do against a sated yi?
So who ever reads this, what is the counter to someone who deals a bade magic damage plus base attack damage plus % health damage, what is the counter other than full tank, and even then, can the adc do anything to kill the enemy jungler before the tank dies?