There are ongoing changes to this mastery on PBE, however what Riot had in mind was that attacking minions shouldn't count for the timer. I completely agree, especially with this damage increase that I linked, it makes sense.
ofart3 votesYup, it's a good change.
redniwediS2 votesWell that'd be a lovely nerf to my early game strategy as Garen...
I've been meaning to experiment with the other defense keystones to see how they work on him. Guess now's definitely the time.
Death by Glamour2 votesWont this just push tanks with no sustain out and ranges harassers back into top?
The Cane Master2 votesTanks are exactly the prime users of this mastery. They stack the timer on minions and walk up to proc it, rinse and repeat. This could shake up a bit this tank meta top, and it's about time.
Death by Glamour1 votesHow would it mix it up when many of the top tier top laners have sustain in theor kits?
PhDs Nuts2 votes[{quoted}](name=Ace 1n your hole,realm=EUW,application-id=3ErqAdtq,discussion-id=Lrmb9TAx,comment-id=000400000000,timestamp=2016-06-07T02:26:03.433+0000)
How would it mix it up when many of the top tier top laners have sustain in theor kits?
Grasp pushes them over the edge. I think the only lane I've lost with Trundle was against a Volibear that was camped by his Shaco.
Death by Glamour1 votesI do agree that grasp is a very strong keystone but such a blanket nerf hurts those with no sustain far harder than the likes of trundle and maokai.
Also im not looking forward to the possibility of graves quinn vlad or even that she devil lulu returning to toplane to make the first 10mins of the game a nightmare
Ralanr1 votesWell yeah, have you ever tried to duel someone as a straight tank like 
? It doesn't work well since most fighters are better built to actually 1v1 than tanks, so much that tanks getting 1.5% of their health back doesn't really seem like a good trade off.
They tried something like this before on the PBE, but it was reverted. I'm not sure why they are bringing this change back.
The Cane Master1 votesYeah while I agree with you, the post isn't about the numbers change. It is about the mechanical change for Grasp of the Undying that Riot has wanted to implement, and had on PBE previously, but failed to deliver. The change would be so that the timer wouldn't be able to proc off of attacking minions, rather champions only. With this increase to dmg (3% of max HP), I think that would be quite good, since tanks are already meta enough.
Ralanr1 votesAll this really does is hurt 's laning further since he has very low starting health and no sustain. Cause I'm not going to try and duel laners better built for 1v1 fights (
and 
were nightmares enough thank you) so I can actually get sustain and lose a trade despite doing the health damage.
This might just destroy this mastery and bring us back to league of thunderlords.
Lord Galvatron2 votesRIP Gner, we hardly knew ye.
Azteryz1 votesim a little confused i see the damage increase but i dont see the part about the minions could someone paste the text?
SaltyKracka1 votesI don't know that they want to go with the "doesn't start when dealing with minions" thing, they tried that before and had to revert almost immediately.