Rework idea for Mordekaiser

Passive - Casting destruction

Using an ability gives Mordekaiser a stack of "destruction" which can be stacked up to 5. If Mordekaiser has at least 1 stack his next basic attack deals 10 - 180 (based on level) (+60% AD) (+60% AP) bonus magic damage and consumes 1 stack.

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Q - Mace eruption

CD: 8 Seconds Cost: 25 / 30 / 35 / 40 / 45 Mana Range: 1000 Radius: 50

Mordekasier targets an area. After a 0.5 seconds delay a mace erupts from the ground at the targeted location that deals 30 / 60 / 90 / 120 / 150 (+60% AD) (+60% AP) magic damage to the nearest enemy. If this ability misses, the cooldown gets set to 1 second.

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W - Metallic air

CD: 12 / 12 / 11 / 11 / 10 Seconds Cost: 60 Mana Radius: 500

For 5 seconds Mordekaiser slows all enemies near him by 30 / 35 / 40 / 45 / 50 %. He also gains a shield for 5 seconds that blocks 60 / 90 / 120 / 150 / 180 (+45% Bonus AD) (+30% AP) damage.

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E - Iron of Fate

CD: 12 / 11 / 10 / 9 / 8 Seconds Cost: 80 Mana

Mordekaiser becomes invulnerable for 2 seconds, but the damage that he would have taken gets summed up and after the 2 seconds he takes 90 / 85 / 80 / 75 / 70 % of the damage at once.

R is unchanged from what it is currently. What do you think? I think this would be a great rework for this man.