User blog comment:Deshiba/Twitch - Tweaked/@comment-1330314-20140327231147/@comment-1330314-20140328153142

A lot of your design philosophy is flawed. You don't build or rework a champion specifically so they can interact with items unless they can't itemize properly in the first place, which isn't the case here. Twitch's autoattacks already proc 's armor shred, as with every other champion, and also apply 's healing reduction. There is no on-hit effect that procs TBC's passive, nor is there any that prolongs Ex Calling's Grievious Wounds, and I see no reason for there to be on Twitch as these are items he doesn't need to build anyway. Twitch already has a lot of interaction with itemization and masteries, just not the ones you want him to have. This is essentially the core problem here: you're trying to bend Twitch's playstyle to your liking, ignoring the fact that his current playstyle is already well-defined and fine as is.

Not only is the playstyle you're proposing with AP Twitch super-unhealthy (the enemy team has only a tiny window of opportunity to attack him in-between stealth runs), but the scaling you proposed is broken: with 40% cooldown reduction and only a mere 160 AP, Twitch gets perma-invisibility. You should drop the AP scaling on this entirely.

The explanation you gave for changing Venom Cask makes little sense: and  have very different functionalities (Make it Rain doesn't even interact with ), and do not in any way justify adding damage to Twitch's W, particularly as he is a different marksman type: MF and Varus rely on their spells to provide part of their damage, whereas Twitch's DPS is almost completely autoattack-based. It's a part of his identity, and adding magic damage to his Venom Cask dilutes it. It also doesn't explain why you changed the Deadly Venom stacks it adds from 2 to : are you trying to steepen his already steep power curve?

You may not have changed anything to Expunge, but you also made no changes to Deadly Venom. It still lists 6 stacks as the maximum. Also, why reduce the number of stacks?