Arena for me so far:
Shaman 1-3 (WLLL)
Warrior 3-3 (WWLWLL)
Mage 5-1 and still playing (WWLWWW)
The question is, can I go far enough with this deck to make up for my losses in the first two attempts to break even overall in 3 attempts vs. buying packs? Wish me luck!
Edit: Curses! 5-3

Edit: Priest 1-3 (LWLL). Never extrapolate.
Edit: Palladin 3-3 (WLWWLL)
Edit: Priest 4-3 (WWWLWLL) ... prizes were all dust.

Edit: Palladin 2-3 (WLWLL)
Edit: Palladin 2-3 (WLWLL)
Edit: Priest 3-3 (WLLWWL)
Edit: Warrior 7-3 (WLWLWWWWL - watching 6 hours of Trump seems to have helped...)
Edit: Priest 4-3 (WLLWWWL - and got the worst prizes ever... all dust)
Edit: Palladin 6-3 (LWWWWWWLL - made a dumb mistake in this one)
Edit: Palladin 7-3 (WWWWWLLWWL - another dumb mistake here)
Edit: Mage 5-3 (LWLWWWWL)
Edit: Priest 4-3 (WWWWLLL)