About the New Grevious wound item
I just want to remind everyone that that item is GOD AWFUL. Like seriously its a bad bad item. Even if you have a heal heavy champ, you need to remember how much damage an ADC loses for building that crappy item. So yeah, you can counter major heal champs like mundo with it HOWEVER due to mastery changes, some spirit visage buffs and grevious wound nerfs heal champs should be just fine. Don't believe me? Lets look.
First, this item is statistically useless. 2500 gold, 40 ad and 40% bonus armor pen. Last whisper on live is 35% total armor pen and grants 40 AD for 2300 gold. First off, just comparing this thing to old last whisper, its terrible. Bonus armor pen works on roughly 50-60 less armor (depending on the champion) so that right there is a pretty substantial efficiency nerf against literally everyone, squishies and tanks. So that right there is a nerf. Now also because of that change, health stacking is WAY more efficient because your base armor is way more efficient. Riot dealt with this issue. They put in LDR, another percent item, to counter health stacks. However, IF YOU BUILD MORTAL REMINDER, YOU DO NOT GET LDR. This means extremely efficient health stacking on champions like mundo, swain and vlad. Seriously, its somewhat absurd.
On top of this, lets look at the new system of grievous wound. This item grants 100% uptime which is good for countering heal however, this is a nerf to grievous wounds across the board (hello morellonomicon and ignite). That means its harder for people in lane to counter stuff like swain and mundo early until their adc gets a mortal reminder. On top of this, if you did have a heal champ in the past, you really mostly only cared about heal reduction in team fights honestly. 1v1's it's useful as well of course but because mortal reminder is so bad and ignite/morello are seeing nerfs from this your 1v1's should feel about the same. So anyway, lets see how this affects team fights.
If you are playing mundo/swain the enemy team (if at all competent) will take one ignite at least. So, you will, for at least 5 seconds of that fight, have had a greater heal reduction. With spirit visage giving you +20% and then ignite taking away -50% your heal right there was mitigated. Thats a 30% reduction overall. Now, that same mundo, will endure the -40% for the whole fight BUT if you look at spirit visage (again 20%) plus masteries (8%) you are looking at a TWELVE PERCENT DIFFERENTIAL. Your heal effectively just got 18 percent stronger assuming (which they almost always did) they have a way to apply a grievous wound.
SO maybe this isn't as bad as you guys think? Let's play stuff before we rage thread circle jerk people. (PS this doesn't include life steal and spell vamp item changes of which there are many, aatrox and swain thank you).