Mage update explained with "guns"
So you are use to your ammo suddenly appearing out of nowhere currently just on it's own.
That is something Riot is not liking so riot is for the most part fixing this issue.
You now are going to aim at getting a large magazine size so you don't have to go reload at based as often but you still have to go to base and reload at some point. This means that there will be times when you are not going to be able to defend mid turret.
This means that you can not play mana regen Ziggs and stall out a game for 20 minutes just by clearing every minion wave while not even going to base to get more ammo/mana.
You now have to go back and get ammo/mana at some point and that is the intended goal of the changes to more mana and less mana regen.
, lets not even get started on the whole "but mages have range" argument. The amount of mobilization in this meta for ad is already outstanding.