Honestly, these new mana changes aren't that bad.
Maybe I just haven't fooled around with the champs that don't necessarily work the best with them, but with my game as Zyra, with just
, I was fine throughout the whole game. Even with poking or clearing waves, we eventually engaged or got a pick out that gave me back 20% of my mana, and not to mention blue buff, with it's extra damage.
Like said, some champs may have suffered worse and I may've not played them to base this conclusion on, but for a first game introduced to it, it's not that bad.