Familiars can be collected!

Everytime GMS edits something from KMS it results in massive bugs and/or exploits.

I'm just surprised seeing how we haven't seen an exploit relating the cards, seeing GMS tinkered with the duration times and whatnot.

Well, version confusions on your part aside, I don't see many ways the cards can be exploited really. The familiar buffs and attacks, maybe, but I'm sure any issues with those could have already been dealt with in the same way the Call of the Hunter hack was fixed. Familiars really aren't that different from the monsters Wild Hunters can summon, after all, and some of the hacked summons even had buffs, so whatever Nexon did to fix that hack could have already put a damper on any familiar exploits.