Face Down + Hidden Mana

I may remove the entrenching. I still dont like the bracket ideas (because you can still tell which -color- it is if you have brackets, too, so you can reasonably tell if the monster is going to have a high attack or high life)

How about this:
1) instead of ?/?/? it shows x?x?x? - a theoretical maximum, which goes up and down based on when he pays mana and gains it of visible cards.
2) entrenching removed.

That way you can make educated guesses- you know an upper limit to the monsters he has in play (if he's got a theoretical maximum of 6/6/6 and played 5 facedowns you can guess they're pretty weak)