Bruiser Morde build comparison (Live versus PBE)
Well Riot thinks Mordekaiser can and was only played as a burst mage on the live game. Wrong! I've always built a beefier Morde and did well most of my games. So before I'm gonna do the math and compare the two kits i'm going to list the items I built on Morde: Sorcs Rylais Spirit Visage Zhonyas Rabaddon's Gunblade (Ca. 3000 health, plenty of resistances and 650 Ap)
So let's get to the point of this discussion:
Mace of spades: Current damage: 460 to 814----------> Pbe values: 430/640 ** Loss of 30-174 damage** Shield strength: 161/284-----------------> 120/240 ** Loss of 40 shield strength**
Creeping Death: damage: 1260------------->1065 ** Loss of 200 damage** shield: 441--------------------> 180 Loss of 261 shield strength
Siphon of farm: damage: 640---------------------->575 ** Loss of 65 damage** shield:224--------------------------->120 *Loss of 104 shield strength
Children of the grave (Calculated with a 2500 health champion with 'bout 250 ad meaning that an ad clone would provide much more shield with his aa's but that'd be the best case scenario)
Damage: 60% max health: 1500-ish no changes Shield strength: 525+ 2625 if the ghost gets one aa every second-----------------------> 0 since the damage doesn't get converted into shield+ 1800(2%max health each sec for 30 seconds) Shield generation lost: 1350
Conclusion: Bruiser Mordekaiser does work pretty well currently and the proposed PBE changes really hurt him as he won't be able to compete with similar bruiser champions in terms of survivability and damage (Like Swain, Vlad, Rumble) Since his damage went down a whole **439 damage ** and his shield generation 1754 points!!
I dare you, go play him bruiser style on the live servers and see that he's not as bad as riot makes him out to be and try to make him even worse as they think he is. He works, really well if you ask me and should be left alone until he gets a rework to address the flaws in his kit but the proposed changes only help to push him out of viability even more.
Thanks for reading and have a nice day.

Edit: A lot of people are bringing up that these values don't reflect the real changes as they're calculated without magic resistance. So to add some more numbers to the bunch I'm going to calculate the shield strength against a target with 90 MR and also one for minion waves(6 minions)
Mace of spades: Shield strength with 90 MR:89/156---------------------->120/240 Increase of 40/80 shield strength
Creeping death: Shield strength: 243--------------------------> 180 Loss of about 63 shield strength
Siphon of farming: Shield strength: 123-----------------------> 120 Minor decrease of 3
Children of the grave: Shield gain(2000 health/250 ad): 289+1444--------------------------------> 1800 ** Increase of 67 strength** Shield gain ADC(2000 health/350 ad/2.0 AS): 231+ 4000-----------------------> 1800 Decrease of 2431 in best case scenario
Conclusion: Mordekaiser's shield gain will be slightly better while fighting champions with high MR as his shield gain's calculated from his maximum health and not damage dealt, however in a best case scenario his shield will be much stronger once he gets his gauntlets on a fed carry, let's say a jinx with high AS and AD.(350 ad and 2.0 AS). The change to %max health damage increases his survivability against tanks but he never really struggled brawling with tanks given the nature of his cult (%max health shred and 100% BONUS spell vamp) All in all he'll** gain 41 more shield while fighting high-MR targets** but since he'd be wasting all his damage on damage-soakers he would be doing a pretty bad job at being a threat that won't be easily ignored.
If he'd get the** best possible clone though his shield generation would go down a whole 2400 damage**, which shows exactly why he's so strong in turning the tides of battle with the right clone.
Another point I want to bring up is the shield generation in minion waves. What most people seem to overlook is the decrease of shield effectiveness against minions. Currently the shield is only half as strong against minions but the changes would reduce it even further to 30% effectiveness. So let's look at some numbers:
Mace of spades: Shield gain minion wave(6 creeps with 0 MR): 322 shield------------->4.8 max hp= 160 ** Decrease of 162 strength, major nerf**
Creep(huehue) death: Shield strength: 1305(all ticks, 6 minions)-----------------> 0.366= max hp=355 Decrease of POTENTIALLY 950 shield strength, also pretty huge nerf
Siphon of Cs'ing: Shield strength: 672--------------------> 1.2*6= 7.2% max hp= 237 shield Again; nerf of 435 strength
Conclusion: His bad laning phase is going to get much worse with these changes and his lategame shield generation is also falling down a cliff as he won't be able to generate as much shield while shoving out waves. This will make him a lot more vulnerable to ganks and surprise attacks on him while he's farming and pushing. Overall he'd lose out on **1547 **shield if these changes go through, making his landing phase and overall shield generation really damn bad.
Mega conclusion: Not only will these changes heavily cripple his shield generation but overall his durability and laning phase as well as getting caught farming/pushing. But that's not all, since his damage goes down a bit he won't be able to get out of 2-3 man ganks by killing one of his assailants and then retreating with a shield generation bot or killing all the attackers. Overall these changes cripple a not exactly OP champion by making his only redeeming qualities, being his defensive and offensive abilities and the threat he poses in team fights, even weaker. These changes might look good on paper but if these go live I fear for the viability of our Brazilian exchange champion :/

getting nerfed - the only time I remember they went back on a rework.
Most item increases and states have been wiped out for Ghosts now so wonky things like Yi’s ult form aren’t worth considering. The exception being something like udyr’s stances or Jinx’s gun. Therefore attack speed will more than likely not be 2.0 for the majority of ADC ghosts. We are looking at a 1.4 or 1.7 in most builds. The chances of someone standing still and letting your ghost pelt away at maximum attack speed efficiency is fairly low so I am restricting this to 1 hit a second.
Morde has no bonus AD in this example so only 75% of his base damage which is 87, bonus damage from Lucien’s items 200, and Lucien’s level 1 base 52 are included.
).
and w/e else i needed
with health masteries that's 3600 hp or so.