Originally, there were all sorts of rules about what your card could and could not be. House-specific was a definate no-no. Otherwise you would have seen at least one Lanni one 
But I am glad it changed. There are plenty of amazing cards that champs have not made, and it is still up to FFG and the playtesters to make sure it is at least remotely balanced.
~Heck, even the agenda was balanced, which means the players are actually better designers than the designers 
