It's time to address how weak Ziggs is now.
Before reading this, if you're here just to tell me Ziggs is getting buffs on the PBE: 1. They were reverted. and 2. They didn't address his problem in the first place. He doesn't need more damage, he needs more reliable damage. See the end for my suggestions.
At one point, he was my most played and by far my favorite, but I just can't keep up the delusion that he's a good champion no matter how hard I try. He just isn't.
Passive: You have to get in dangerously close range to use it, which completely contradicts the rest of his kit. Sure it can be used on towers, but how lame of a passive is that? 'Every 12 seconds you do a little more damage to towers.' Very exciting. And since I know it's going to happen, I'm going to go ahead and deal with the Lux comparison. Lux's can be applied to multiple targets, including minions so it can be used to farm. Not only that, it's applied with her spells, not her autoattacks, and can be triggered by her ult, again, on potentially multiple targets. She also has a two second snare, so she's able to keep a melee target with a gap closer subdued long enough for her to get at least one auto off while still being safe.
Q: Great spell if your opponent is limited to only moving in one direction or only stands near minions, otherwise it's damn near impossible to hit.
W: No complaints on this one.
E: Great for zoning, but that's about it. Too much mana to use for wave clear, too inconsistent to use for damage.
R: Similar to his Q, this ability is really great if the enemy team is incapable of moving when Ziggs tries to use it. As that's rarely the case, this ultimate is absolute ass. At full range, you have a whopping three and a half seconds to get out of the way. At point blank, you've got TWO FULL SECONDS to get out of the area. On top of that, the damage outside of the relatively small epicenter is significantly less. Despite all of this, it has a huge cooldown at all ranks, 120 seconds. There's absolutely no reason the cd of this ability shouldn't go down with ranks as it used to.
The nerfs that killed him:
Mega Inferno Bomb cd changed from 120/105/90 seconds to 120 at all ranks.
Ziggs's Q explosion detection radius reduced to 150 from 180.
Ziggs's movement speed reduced by 5, and his range reduced by 25.
Honestly if you just revert the CD nerf on his ult and either the Q explosion radius or the ms/range nerfs he'll be fine. He doesn't need more damage, he needs more reliable damage.