General

Spikes Royale->Leaf Tornado->Gust Dive->Rising Rush->Rolling Moonsault->Leaf Tornado->Gust Dive->Lightning Edge->Unicorn Spike its kinda more of a useful loop for charging ignis and for fun :o

Also, You can Lightning Edge->Leaf Tornado :O?

+1 to this thread. I just hit fourth job and was like "WTF?" after I got all these new skills. Having a really fun time with this class so far =]

This is my keyboard layout. I highly recommend it.
http://i.imgur.com/r27IzHz.jpg

As for the comboing, there isn't much to know but a few things.

1. For training, there is only one combo. And that is spamming lighting edge + leap tornado at the same time. This bypasses the lag at the end of each lighting edge.
For training at SDH, you can start from the left of the map, hold down right, spam lighting edge + leap tornado 3 times, you will be on the right side of the map, turn around, hold down left, spam lighting edge + leap tornado 3 times. Occasionally, you can add Warth of Enlil when you are in the middle of the map to clear the mobs who spawn on the middle platform.

2. As for bossing, there aren't much combos but a few things you need to know.
You can "animation cancel" with certain skills as a mercedes to reduce the awkward lag (standing around doing nothing) at the end of certain skills. In some sense, this concept is a lot like animation canceling with riven in LOL (but balanced, kappa).

Rules of thumb:
You can only use unicorn spike, rising rush, spikes royal and lighting edge when you are on the ground.
You can only use Leap tornado and gust dive when you are in the air.
Rolling Moonsault and Aerial Barrage can only be used after using rising rush.
If you use a skill that starts on the ground and ends on the ground (unicorn spike and lighting edge), you can animation cancel by chaining wrath of enlil afterwards.
You can animation cancel unicorn spike with spikes royal.
You can animation cancel unicorn spikes, lighting edge and rolling moonsault with stunning strikes.
You can animation cancel stunning strikes by chaining wrath of enlil.

With that in mind, we can create a couple of combos with animation cancel.

A beginner combo would be something along the lines of, Spikes royal -> leap tornado.

After leap tornado, we are still in the air, so we can use another skill which can be used in the air (ie, a second leap tornado, gust dive, wrath of enlil or stunning strikes), and so on.

Most of the times in bosses, you would want to use Ishtar's Ring as much as possible because that is mercedes' main bossing skill. However, Spikes royal and lighting edge both can increase the damage dealt by Ishtar's ring so we want to combo those two skills in every couple of seconds.

A good combo to maximize dps by using animation canceling would be something along the lines of.

IR -> stop -> Unicorn spikes (because we are on the ground) -> Spikes royal (animation cancels unicorn spikes) -> stunning strikes/wrath of enlil (because they can be used while falling) -> lighting edge -> stunning strikes (animation cancels lighting edge) -> stop -> IR.

Please note, rising rush + rolling moonsault makes you invulnerable for a couple of frames. This used to be very useful back in the days because the damage cap was 999999. Nowadays, the trade-off in dps for those couple of frames of "godmode" isn't worth. Only situation where the rising rush + rolling moonsault combo is useful during bossing is to dodge the empress tornadoes.
Of course, you can always come up with new combos and find out new ways of animation canceling. Mercedes is one of those classes that can have a lot of combos. This is just from my personal experience of playing mercedes since they came out. Have fun with it.

[quote=xLelouchz]My favorite combo is Spikes> Leap tornado> Gust dive
Keyboard layout: http://gyazo.com/890b071b82f1d66e16395e205347a844
I've got a crazy layout, lol.[/quote]

I've got a pretty crazy layout also, as well as 3 macros for buffs, which sucks at bosses.
We have so many usable skills for different scenarios.

My favorite combo is Spikes> Leap tornado> Gust dive
Keyboard layout: http://gyazo.com/890b071b82f1d66e16395e205347a844
I've got a crazy layout, lol.

Who's ears did he steal?

[quote=juubee]Definitely a goblin[/quote]

I concur with this judgement.

[quote=hongfung]But you could be a goblin. [/quote]

Definitely a goblin

[quote=wall]I have the ears too[/quote]

But you could be a goblin.

[quote=saharshap]expanding on what @juubee said about Rising rush + down and aerial barrage being good against Magnus:
Mercedes have certain frames during their skills that make them invulnerable. When Magnus uses his spin attack or rush you can dodge it with that combo. Mercedes can also use lightning edge and be immune to Magnus' rush attack (only occasional and I don't know what triggers it).[/quote]
if magnus currently has the lightning edge debuff on him you're immune to the rush attack

expanding on what @juubee said about Rising rush + down and aerial barrage being good against Magnus:
Mercedes have certain frames during their skills that make them invulnerable. When Magnus uses his spin attack or rush you can dodge it with that combo. Mercedes can also use lightning edge and be immune to Magnus' rush attack (only occasional and I don't know what triggers it).

1) For bossing I do spike+gust+edge+unicorn to apply debuffs and then I spam ishtar.
Mobbing really depends on the map. Horizontal maps I use Rising+moonsault+wrath. Vertical maps I use Spikes+tornado+gust+edge+strikes.

2) Keyboard: http://tinypic.com/r/2eol3tg/8

For traveling across maps sometimes, I spam lightning edge and leaf tornado (mostly for cvell).

Bossing debuffs I go unicorn + spikes + and wrath of enlil to finish. And maybe lightning edge too for debuff if I feel like it.

Rising rush+down and aerial barrage is good in Magnus.

Number 1 combo I've been using for almost all situations (bar bossing) is Lightning Edge+ Stunning Strikes+ Lightning Edge... It fills your Ignis Roar rather quickly, gets you across maps, and does decent damage. Feel free to add in a Unicorn Spikes, Spikes Royale, or (once you hit level 170) Wrath of Enreal
If you're on vertical maps or just need to go up you can do Rising Rush->Rising MoonSault-> Ariel Barrage.
For horizontal+vertical distance you can macro Leaf Tornado+ Gust Dive is pretty good.
If you're trying to hit two platforms (one you're on and one right above you) you can do Spikes Royale and Wrath of Enreal midair. I fyou don't have Wrath you can substitute with stunning strikes.
Most of the time my combo's are spamming different skills in order to cancel the end animation of skills.

I can't upload my key layout as I'm away, but for the most part I have buffs macro'd together on two seperate macros, stunning strikes on ctrl, rising rush on shift, moon sault on S and ariel barrage on T. D is reserved for my leaf tornado + gust dive macro while 6 is my gust dive alone. C is unicorn spikes and V s my Lightning Edge. F Is Wrath of Enreal, G is Elemental Knights and H is my spikes royale. It's pretty messy, but i'm used to it.
Fiddle around with your keys until you find something you like.