Re-proposal to spellslinger's surge effect

Stormraider's surge as it is now has a unique effect, it'll proc for champions who have powerful scaling spells example:

From my knowledge, these are the champions who rely on surge more than anything spell and I can tell you... nasus, veigar, and mordekaiser.. Will be doomed without them being able to proc 30% of their max health because all 3 have spells that can proc it when they need it

Nasus: he relies on this more than any other rune because he can keep up with the enemy and once they are near him with this they must fight him it allows nasus to have kill pressure as a duelist in splitting

Veigar: I read about the comment section for veigar and I can tell you that he is right, Veigar uses surge for safety to get away from assassins after the tiny man but it'll hardly help him but he has this for mobility which is so necessary for the late game.

Mordekaiser this guy is doomed without surge. He will be completely doomed to even lane without it He procs surge easily because he presses e and SMACK with the q and he blows em up procing it to get the movement speed to keep up with them and deal his damage.

TL;DR I want surge to have the effect of 30% and unique 3 spells if necessary because some champions rely on this because it's not in their kit.

these champions are rewarded for it at the end of the day as well (ryze may abuse it a bit too much) but there is more pro's of keeping it to 30% then 3 unique spells for some champions i like surge to have a health procing even if u have to lower it's stats and benefit's it's necessary for those few champions who are immobile.