The Zekes change has me a bit worried.

Zeke's Harbinger Total cost: 2300g Recipe - Glacial Shroud + Aegis + 300G Stats: 55 armor 30 MR 250 Mana 10% CDR Unique Active - Conduit: Bind to target ally (0 second cooldown) Unique Passive: Casting your ultimate near your ally summons a local frost storm for 10 seconds. As the storm rages, nearby enemies are slowed by 30% and your ally's attacks burn their targets for 60% bonus magic damage over 2 seconds (45 second cooldown) Frostfire Covenant - Attacking a burning enemy ignites your frost storm for 3 seconds, searing enemies inside for 50 magic damage per second.

Quite a few champions concern me with this item.

Would finally be useful after his initiation. His current weakness is that he can't do much after he goes in besides ult and wait on CD's. This slowing field changes all that. could become meta. It gives him mana, CDR, and resists; all thing Blitz wants. Due to his short R cooldown, he can proc the effect on cooldown. especially when with his ladyfriend, Rakan would be devastating. Those resists, when combined with an HP item, would be amazing. The Quickness was already strong; adding a slowing field to that is crazy. Oh, and the 50 DPS aura helps with his issue of having no damage. won't be buying it himself, but he is the only marksman who builds magic penetration; that 60% damage increase is incredibly good on him. Guess what? Now he exists after his ult. can now sell his Rylais late game for a Zekes; exchanging a bit of his own damage for a 60% increase to that of his carry.

And that's just off the top of my head.