"Some monster cards aren't dropping" issue isn't a glitch.

Nope, there's a portal with a message showing 4 optional leading you to 4 different rooms. It only shows Dawn->Darkness (Warrior/Mage/Bowman/Thief KoC Summon) spirits only. o_o

I was Lv 157 When I tried to get the Cheap stereo card. First I had to get the VIP tickets wich took me 15 minutes. Then i've been looking around for 30 mins straight for the card but none dropped. So that can't be the thing with my issue. But it might help for others.

It's because you're hunting the wrong monster.
You don't need VIP cards or anything of the like. You just talk to the NPC and enter his map. The VIP tickets take you to different monsters that have enhanced stats, iirc.

I finished all of Kerning Square in like fifteen minutes, and I never got a VIP ticket, so...

Nope, there's a portal with a message showing 4 optional leading you to 4 different rooms. It only shows Dawn->Darkness (Warrior/Mage/Bowman/Thief KoC Summon) spirits only. o_o

You need to do the Empress questline then.

Because it's almost statistically impossible that a card which have a 5-10% drop rate doesn't drop in 200 kills.

Probability is the proportion of an event occurring out of INFINITE attempts.

This means that I could kill 500 Yetis and not get a card, but as the number I kill increases ad infinitum the ratio of the number of cards that drop to the number of Yetis I kill will TEND TOWARD that probability of 5~10%.

Therefore, the probability of 5~10% does not necessarily have to APPEAR to be correct within a finite number of attempts.

welcome to:

http://en.wikipedia.org/wiki/Random_number_generator

Probability is the proportion of an event occurring out of INFINITE attempts.

This means that I could kill 500 Yetis and not get a card, but as the number I kill increases ad infinitum the ratio of the number of cards that drop to the number of Yetis I kill will TEND TOWARD that probability of 5~10%.

Therefore, the probability of 5~10% does not necessarily have to APPEAR to be correct within a finite number of attempts.

Yeah, that's what I meant. Just expressed myself badly.

Ah, this makes senses now and I could confirm it. Both my friend and I are level 165 and attempting to hunt the future ereve cards, everything up to Advanced Knight B which is level 179 (The mage that summons ifrit and does the Flame Gear.) dropped it... after a while we decided to hunt Knight C (The pirate one) it didn't drop after over 100+ kills and wasting 500+ elixers/powers ._.... However, when we asked a fellow DrK who were 186 that was there hunting cards as well to kill for us, it dropped pretty much in 2 kills. So I'm quite sure it's following the 14 level limit system.

Also does anyone know where to find Lightning? I need the card D:, or is it in that locked room I couldn't enter?

go to the portal at the top of Knight District 2, that takes you to the other spirits.
EDIT: didn't read other comments. I guess you need to he 170 and do the empress prequest.

Isnt a glitch... you need to be in the range of 14 levels lower between the mob and you to get the card....

I've suspected the level gap plays a role ever since the first day of crusader codex when I didn't manage to get Skeles' cards (level 133, they are 150) but was told I'm just having bad luck by some buddies (*cough*combattente*cough*). Good to know it is true.

Isnt a glitch... you need to be in the range of 14 levels lower between the mob and you to get the card....

Okay, um, why in the world did you repeat what was said in the very first post?