Q_x wrote:How about this restrictions:
A creature is allowed to carry maximum of 4 equipment cards, /../ Mor ethan four cards stack is hard to parse in mind quickly or memorize.
If the reason is for the player to be able to memorize the exact ability and stats of each creature then we shouldn't allow
any extra cards to be put on a creature, really. Most humans would fail even that. I certainly would, but maybe it's just me.

Instead of taking my word on it why not do a test and check your own ability:
Play a couple of MtG games and use a simple restricting rule - only allow
one single card to be attached to a creature, no matter what the card type is (meaning, only one equipment OR only one enchantment etc). I am certain there will be very very few moments in any of your games where you knew all or even half of the info/abilities and stats of the creatures on the table.
Reason would be that there are so many combos in a CCG and so huge variation on table, not to mention people change decks and also tweak their decks between games. That, and the fact we have pretty poor memory. Honestly, I wouldn't be able to play MtG with
creatures only even without having to read on their cards.
So, memory issues don't seem to actually motivate such a restriction. If anything, they should motivate 0 extra cards attached, or possibly maybe 1 card attached, if any. Am I mistaken here? Do I underestimate the average persons abilities? (Would really be cool if some of you did the test... it's maybe me that's brain damaged.. lol...)
I just also re-read your suggestion, and there you mention only
Equipment specifically, so maybe it wasn't related to memory issues at all? Because it would still allow a creature to get other cards on it as well, not to mention to be under the influence of another creatures abilities (Ex: Elvish captain while defending). What I mean is that if it is a memory issue, then we have it all over the game and would need to re-vamp plenty of things that would be on the verge of redefining it as CCG. However, since all other CCGs seem to work fine (or do they? is this a problem I have missed out?) maybe there is no memory issue? I'm not sure here...
I any case, since the equipment that shares a subtype doesn't stack, most of the time a creature would seldom have more than 3 equipments on it as it is already, especially if "weapon / armor / other" are made into equipment subtypes ( examples: Sword / helmet / potion) It should limit the amount of data to parse/memo.
BTW - do we use BE (-our) or AE (-or) language here?
I see no reason to use AE anywhere as it's just a copy of the BE. However, I master none and mix all myself, so we'd have to let our lingo expert look at all cards etc. Or what do you think? Maybe most people, internationally, are used to seeing the AE and would find the BE strange? It's important that we don't alienate the players and use a language that is easy to understand.