Deck construction restrictions?

So I've had Dungeon Brawl in the works for a while now, I've been reconstructing the deck construction as well as the cards for them and I need some input.

A deck is 20 cards. Hand size is 7. Deck construction read: "max 2 copies of every card except armor and weapons which was max 5 of the same card and up to 8 cards total of armor and 5 cards total for weapons." Confusing, right? Looking at it now, it looks like I'm forcing players to play a certain way and taking away choice, but in doing so, forcing balance.

So I just changed names on weapons and armor but made them do the same thing so I can write "max 2 copies of every card". I'm now worried with the change, everyone will just take as much armor as possible then fill the holes to fill 20 cards because the point of the game is to be the one with the least amount of damage at the end of the game. What do I do to prevent this?

One idea was implementing a point cost to all the cards while still enforcing the 20 card deck standard. This seems overly technical for something I want to be more fast and easy. I don't need players doing math before the game even starts. Also, if I were a player, I would pay whatever cost to get as much armor as I could and once again fill the rest of the 20 card deck with low cost attacks. Another was putting a hard cap on armor: No more than half your deck can be armor. Then reduce hand size to 6, or even 5. If I went this route, armor would be prioritized even more due to the need to protect oneself. Going back to the cap of 8 armor cards seems reasonable.

Can you think of anything else? Or are one of these decent enough?