Really cool card. Tess Greymane is particularly pleased - have any of the specific 'get legendary' cards actually been discover prior to this? She'll actually get to choose who she runs alongside, instead of playing something like a Face Collector and being sad when you roll neutrals or low powered options.
Damn, most of these new cards are insane in Arena, this one is no exception. Some legendaries are bad, but narrowing it down to class cards almost guarantees some good combo / value. And it triggers burgle synergies, I dig it.