Presence of Mind changes WILL be broken
Currently, changes to Presence of Mind are:
No more CDR/Mana regen on kills. Instead, you gain mana AND ENERGY BASED CHAMPION WILL GAIN 10 ENERGY PER KILL UP TO 50 BONUS ENERGY.
This WILL be broken on certain champions who are gated by energy.
Look at Akali Q-virtually no CDR, gated by energy cost.
Let's think about this: at max rank, Q costs 80 energy. Akali has 200, but an additional 80 from her W, effectively giving her 280 energy. Thus, she can Q three times and proc passive a minimum of 3 times. Let's think about the changes.
Now, with 250 energy, she can Q 3 times without shroud. With shroud, she will essentially have 330 energy, making it so that she can Q FOUR TIMES and get 4 passive procs.
This is insane. Akali is mostly played mid and it's quite common to take Precision as the keystone page anyways since many Akali players take Conqueror/Fleet.
On top of this, Conqueror now grants more Adaptive damage and 15% healing. This means that Akali, being AP based, will gain a LOT more from Conq than AD champs (since Adaptive damage converts into more AP than AD).
This rune will be abused by Akali specifically, and possibly Zed. I really think this will be broken.