The recent wave of bannings are a great first step towards putting this game back on the right track, which is to say, making it fun for players of all experience levels. Olcadan's and Bitter Rivals alone made deck building an absolute chore, and eliminated 80% of the game's options. Amongst all the bans, one card was mysteriously overlooked: Blood Runs True.
This card has been talked over to death, and for good reason: it is a brutal, punishing card that helps on offense and defense. Are there ways around it? Of course. Is it fun to play against? Never. Especially for newer or less experienced players. Let me break it down a bit:
1 - Rarity. This card is truly a case of the haves vs the have-nots. If I was a new player and wanted to be even remotely competitive, I'd have to fork up $160 to get a playset of this card. One hundred and sixty dollars for 4 pieces of paper! Unless I feel like wasting money, I will never acquire these cards and will always have to play around them, which brings me to my second point
2 - Everybody has to run anti-control hax cards in their decks. Its foolish not to, otherwise you can't play your cards. You have to hope they don't get 2 or 3 BRTs out first turn (which happens more often then not), because if they do, they'll certainly make sure you never play Destiny, or whatever anti-hax card you prefer. Hell, they can even hack your response to a hack if you feel like playing hoping for a challenge or something.
3 - The hack itself is extreme. On occasion you reveal an attack and don't get the full brunt of the effect, but even the most hardcore aggro decks run lots of foundations. 20 attacks is still 1 in 3. Most decks run less attacks then that. Odds are your check will get -5 which is either auto-fail or commit everything to make it pass. And they can do this to you 4 times in a row if they feel like it!
4 - You shall not block. As annoying as it is to not be able to play cards on your turn, the final kick in the face is when it comes to blocking. BRT is basically a last second +5 speed boost. While plenty of cards can give you a large speed boost, they do only that: boost speed. They don't have alternate, overpowered uses. As an offensive and defensive piece, there is literally no reason to not run this card. Sure you may give your opponent an attack, but why does that matter if you have more BRTs? You'll make sure they fail that as well.
5 - The biggest reason I see BRT as a problem is enjoyment of the game. If a new player is trying to get into the game and has everything hacked to hell, what would make them want to stay around? When this game first started it was really fun, trying to play more attacks then they had blocks. There was very little life gain so if you managed to make one decent attack go through, that damage stayed. The back and forth play kept things lively and interesting whereas now, well, we all know what the game is now.
So while yes, there are ways around this card, and yes, there are ways it could backfire, overall the card is not balanced and no fun. The best possible errata for this card would be to make it "unique" but if we really want a change in this game then Blood Runs True needs to go.