IMO:
- Players should NOT be forced to play mono. Some elements cant pull it off well.
- Any mark should be allowed. Its pretty important for deckbuilding.
I wouldnt put too many restrictions on deckbuilding. Players will have a tough time finding off-element cards anyway, so its likely to see decks based on their home element even with zero restrictions.
Now, do we want to allow well developed
player to use say
rush? I actually lean towards "why not". First loss will ruin his deck anyway, and he'll have to go take
cards again, until he can afford to play whatever again. It could actually be quite funny to see how players develop their decks and their personal Vault.
Of course, limits on 50% from in element could be in place here too. Would be more thematic, and the only thing that worries me is players avoiding duels with elements they have a hard time against.
This is more or less exactly how I feel about WoE deckbuilding. We should definitely give players as much freedom as possible, without killing the theme.
One thing that concerns me though.. if we have a high level rich

player, he or she could potentially play anything BUT

. This is a problem, because if we have a person with a "Champion of Life" title, one might think that the person actually uses light. If this person attacks with

cards, I think that it would be kind of lame. And with tons of cash, a player could do this for the duration of the event, without playing a single

card.
One thing (also mentioned in the first post) I thought might solve this problem is to have that player lose

reputation when using a non

deck. That would enable the player to use any deck out there, but doing so repeatedly, would make his own element not like him. Or do it the other way around. When a player wins with a deck of his or her element, that player gets reputation.
I don't know..
One previous idea suggested by someone a long time ago was that your mark would be determined by the area you are in. I absolutely LOVE this idea. It's like your mark is actually your physical surroundings. So if you attack

area, you need to use a

mark, giving

players an advantage (in most of the cases at least).
However mark is such a big part of the deck that it won't work. Besides,

would crush

pretty fast with Graboids.