This card says that it will do an additional 3 damage if it's attack is not blocked. However it seems to deal the damage if the attack IS blocked. I think either the card or the text is wrong.

I think I may have been wrong about this and gotten it confused with another card that has similar artwork.

I took a look at this card and it seems all right.
If there are others cards you are not sure about, feel free to report it. It always good to check!

Sorry to flip back on this, but I'm positive that this time it happened. I completely blocked the attack and still received the 3 damage.

if you play this card and you do not block the opponent's attack, you inflict on your opponent 3 points of damage.

If you still see this bug can you tell us in detail the stroke?

Ah jeeze it actually is working fine. I was confusing the "you" and "your opponent" in the text. The card was in the other guy's hand and I forgot to reverse the pronouns.