I'm not sure we should have a perfectly symmetrical rare card distribution. If we have 6 rare cards plus made all the Dragons and Alchemy cards be semi-rare or expensive like we talked about in other threads, some elements will only have half a dozen cards to use. If we made some elements have more "rare" cards then it could be a small nerf to some of the elements that have a stronger card pool then others.
There was some talk about semi-rare cards in the past, but now that we have 6 different crafting skills, each with 12 rare cards, there's no reason to have these semi-rare cards. In fact, having then would make deckbuilding very difficult because of limited card pool.
I count only 8 permanents in the game, so we may should count other cards as permanents too or we put spells and permanents together.
That's a good point. I totally forgot that some elements don't have non-shield non-weapon permanents.
That won't work. Easiest way to fix this is to just get rid of the whole permanent thing, and go with 5 types of crafting. Actually we might save that 6th type of crafting for crafting
items (things you carry around).
Btw: What is with Shards? Are they super rare, wich mean you only can get shard through quest and than you must pay the upgrade cost, or the normal Shards just a Spell/Permanent as each other, but useless?
Shards will be super rare and only obtainable from quests or when buying from other players.
I think that nymphs should not be a part of crafting, because not many have access to nymphs.
Yes, definitely. Nymphs are out.
Thing to consider: if some rare is built from combining other rare, you just made it... more rare than rare.
Some elements will have extremely tough time with 1 of everything being rare. I'd maybe suggest hand picking whats rare in what element; in other words, dont make 1 of each category rare. You'll see what I mean when you try to finalize the list on how rares are crafted. 
Yep. Crafting will always be done by combining one or more non-rare cards to a rare one.
