Mordekaiser ult rework idea

If his ult were to be totally scrapped i'd replace it with this:

Passively grant spellvamp and lifesteal that scales with rank - 5/10/15%. Active effect would give him increased movespeed (5-10%?), a full shield, shield regeneration (at a rate somewhat slower than yasuo's), and it would double whatever his current passive stats are (so a max rank ult would give you 30% sv/ls). All for about 10 or 15 seconds. Cooldown maybe about 90 seconds or so for what it's worth. Think of it something like Singed's ult, but geared towards Morde obviously. This is more so emphasizing his ability to stay in combat and being able to eat a lot of damage while also putting out relatively good dps himself.

The problem I have with his current ult is that it doesn't synergize at all with the rest of his kit and really it's just a very bad, clunky design. Sure it's a decent execution to finish someone off and it gives you a nice little boost in stats but then afterwards you're just left with this useless ghost, which ironically is what the whole ult is centered around. In a full blown team fight (or really at any point in the game) very few players are going to use it to it's full potential, if anyone at all. You're focused on YOU, not on trying to manipulate some silly ghost to attack something/someone (and only if it's the adc will those attacks really be useful) especially when there are other threats around. The most I get out of it is to tank some turret shots after an ace or something of that sort. I mean really if we could look at some kind of damage output chart for these ghosts it would be laughable.

Anyways, this is only an idea, but my point is that Morde should really get a new ult, something that actually synergizes with the rest of his kit, that being his ability to survive tons of damage while pumping out his own at the same time in my opinion. I just really love the idea of him being this unkillable beast (or at least very hard to kill) while having some really solid dps himself.