Huge Block output, and it's awesome to have so much scaling on a single card because there are ways to double-play it and get twice as much. For example, if you take this and upgrade it, then use a Duplication potion to play it twice, you'll have ~20 Passive Block per turn for the rest of a lategame Boss fight. That's massive, and lets a deck which was previously poor at Blocking coast through lategame. A bit of Block per turn > tons of Block at once, since you don't waste as much of it.
