My probably terrible league idea

This is a probably terrible idea but I've been thinking about this for almost ever.

Here’s the skinny of it:
12 teams - either 2 6 team groups of 1 large table.
Each team plays each other twice(unless there is division, then they play each other 3 or 4 times)
4 team playoff or 6 team playoff
promotion and relegation - Botton 4 goes to relegation where they play qualifying team for their spot in the overall league.
“but var1ables, where do you get the teams?”
This might be kinda weird but I'm guessing that it’s going to go two way, Either through  selecting the best teams from the best leagues of each nation(EPS or whatever each country uses).  Those guys get an autoberth. If not invite or tournament to decide the participants.

After the first season the teams still there then it’ll go something like this:
all the winners of the national tournaments go to a tournament. THe people who win then go on to play the bottom for of this league.

This allows for the national leagues to stay that - national - as well as give them some importance to the overall scene.

For CS it’d be something like this(bold go to playoffs):
IDEA A:
Group a
SK
mTw
winfakt
mouz
Lions
alternate

Group  B
fnatic
navi
Again
ESC
anexis
Moscow 5 

IDEA B:

SK
mTw
winfakt
navi
fnatic
mouz
anexis
Lions
alternate
Moscow 5
Again
ESC