I know this has nothing to do with Arsenal

I think it should be 5 yellow cards, I don't like amnesties because they are only fair on players who's style of play means they rack up yellow cards, it's not fair if they get away with it

however the current system still supports those kinds of players, as they will serve a ban early on which makes them more likely to make it to the final

maybe 3 yellows then a ban for the group stage, then up it to 4 for last 16 and quarters, 5 for semi final

so easy to get booked these days that 3 is madness

biggest game of a players life (arguably) and he could miss it for kicking the ball away in frustration.

There should be a clean slate after the group stages

There should be a clean slate after the group stages
----------------------------------------------------------
there is.

biggest game of a players life (arguably) and he could miss it for kicking the ball away in frustration.
---------------------------------------------------
then he'd be stupid, and deserve to miss the final. everyone knows that is a yellow card offence, if he's already "walking the tightrope" and then kicks the ball away then he's an idiot.

Nope. Players know in advance so it's their fault if they get booked in the second leg of the semi. It's not like it's difficult to go a game without getting booked.

If you knew that yellow cards in the semi didn't count for anything then what's to stop you fouling all game until the ref books you? (Alright a lot of players do that anyway)

There should be a clean slate after the group stages
----------------------------------------------------------
there is.
-----------------------------------------------------
I don`t think there is.

Oh my good god. THREE BOOKINGS IN TWELVE GAMES IS NOT WHAT HAPPENS. It's 3 in 6. Wiped after group stage. 33%. The Premier League incidentally is 8% and a ban. Always stunned when people bemoan rules they don't actually know. And of course these rules are only whined about repeatedly when they affect a PL team.

There should be a clean slate after the group stages
----------------------------------------------------------
there is.
-----------------------------------------------------
I don`t think there is.
----------------------------------
then you're wrong.

it's 3 in 6

If you get 3 bookings in 6 matches you've done a lot wrong and it probably benefitted your side with cynical fouls, hauling down players on counters, time wasted or gave opposition minor knocks in the process.

If that's what it took for your side to progress then you should miss the final ful stop.