Mordekaiser: The Master of Metal
I've taken quite a liking to this champ recently, even though many say he's not good, he's been alot of fun. However, I do see where they're coming from. 
I even looked it up, and it's a fact that Mordekaiser is the ONLY CHAMP IN THE GAME without any Crowd Control (Stun, Slow, Knock-up) or escape mechanism (Dash, Blink). This made me think, and I have some ideas on how to make Morde more viable in a modern game.
His abilities are fine, I have no issue with them, but some slight mechanics need to be changed.
Well-Oiled: Along with the shield that he gets from damaging spells, he should get another bonus for damaging enemies. Whenever any of Mordekaiser's abilities damages an enemy, he gains a bonus % of movement speed Enemy Champions: 5% bonus Enemy Minions or Monsters: 1% bonus This can stack 5 times, and it lasts 4 seconds, but refreshes on every new stack. This update to his passive will allow him to stick to enemies without needing CC Another part of his passive: Heavy Metal: Knock ups are 50% shorter and slows are 25% shorter on Mordekaiser
Mace of Spades: When used, enemy champs are prioritized for the 3 extra targets of this ability over minions. Sometimes, Mordekaiser has a hard time harassing in lane with Mace of Spades targeting creeps instead of Champs, even if they're close. This will also allow you to target a creep for a ranged attack on an enemy champion
I honestly don't think Morde needs CC or a Dash to catch up, if he can just stick to a fleeing enemy, that would be enough. The shorter knock ups and slows just make him a train who won't stop until he has his target. Some people have suggested total re-works, which I don't think he deserves, being a very fun champ already, who just needs that little push to be viable again.