Karthus Will Become More Usless Thanks to Edge of Knight
It's bad enough that champions can dodge his ult with non-ultimate abilities but you had to give a Sivir E on an AD item? https://3.bp.blogspot.com/-gmcdzmBToVM/WAaI558Cc2I/AAAAAAAAWQI/Yi3650L7FjUi7z4noljMN7cZl_ZK9pvtwCLcB/s1600/item3.jpg It's hard enough to land Q's thanks to the MS people seem to get out of nowhere, but now an ADC can buy and item with magic resist and be able to block an ability? Let alone this can be used at the start of a Team fight and last up to 10 seconds. I really hope that some numbers get changed since Karthus buffs seem very unlikely.
Edit: Going to add this item since it is a Soraka like heal which although it has a high cooldown and is retricted to an area still hurts Karthus at the end of team fights. (Thanks Bombay Sandwich)
(some less so than others, but same general idea).
So... another nerf to me, hmm?
... Screw it.
outclassed since the shield is always on and comes back after a longer cooldown.
. Land a bunch of Q's, possibly bait out any escapes or shields they have, and THEN ult if you die or ult while they retreat. You might not even have to ult and just kill them with a bunch of Q's. Karthus is really strong right now, especially lategame. He doesn't even need to buy boots, just sell them and get a liandry's or something and then your Q's will be doing 800 per hit.
An item like this already exists. Hexdrinker for just 1300 gold hard counters a random Karthus ult.