Hey there, interesting concept!

• How much should it cost to create a card and claim ownership?
  I think 0.2 HBD is reasonable for a start.

• How much should it cost someone to copy a card owned by someone else?
  Not sure. But I think the cost should increase with every new copy make so that it incentivizes early creators to think of something good. Side-tracking, won't it be great if the original creator get to earn some royalties from subsequent copies?

• Which words should we allow into the whitelist for card creation?
  No preference

• Which words should be free-to-play?
  No preference