I just want to say a big reason Morde did so well in LCS is because the team comp was so good
This could be said about any game, but let's look at the flyquest game vs Envy G3
The team on Flyquest was:

It's a comp obviously made to fit morde's style, except graves. nice lock down from naut and blitz, speed boosts and shields from ori.
Due to morde's pitiful MS, along with the lack of cc, if we have
on your team, the effectiveness of morde bot would be very diminished.
As a noob morde (sorry morde mains), i had good and bad games. I realise how important team comps are when playing morde. This might not be true if you are experienced on morde, but if you are going to be an inexperienced morde player in rank just cuz you saw LCS, keep this mind and check your comp.
or
instead of fucking
and
every game.