Before I begin, I would like to clarify that this is not a post crying about howis underpowered, or that he needs buffs, or anything else of the sort. I love Swain, and think that, if anything, he is too powerful because of how high is ratios are. With that out of the way, let's get started.
What I thinkis:
A way for him to maintain a reasonably high amount of mana in lane to deal with the high early game mana cost of his abilities. This, in my opinion, is not wherefails. I believe that it makes 's early game manageable, and simultaneously makes it so that you need to balance the amount of farming you do and the amount of damage you can deal to your lane partner. This adds a great depth of play to .
Althoughmakes have an interesting early game experience, it does not scale well at all into late game. To put this in perspective, the passive on 's level two will give him the same amount of mana for killing units that will give at level 18. Not to mention that has a much easier time of farming with minimal mana than does. Also, a will give half of the effect that does at level one.
Perhaps changeinto something that provides an additional level of gameplay, such as does for or does for . This would need to be something that gave mana, considering that is what he really needs out of his passive (either that or something that made it so shields didn't so easily save people from ).
Draft of passive, suggested by the community, specifically Archonell and Emptylord:
This would allow to scale into late game, because it's a percentage.
Questions? Comments? I want to hear all of them below!