It's Knight of the Ebon Legion rich cousin, the blackguard. While she's going to make combat confusing enough on attack, that last ability is going to make attacking into you very difficult with enough Treasure. Wonder if this means mono-black aggro will run enough Treasure-matters for this card.
In my artifact cube you go, where black/red gets a sac/treasure theme.
Seems like the Gilded goose of treasure, but Ragavan still makes this looks bad.
At least in Modern, Ragavan, Nimble Pilferer gets blocked all day and removed all night, so unlike Forsworn Paladin, he is not a reliable Treasure-making engine. Ragavan needs ample removal to succeed, I've found. Ragavan also performs at his best against U/x Aggro-Control/Tempo, I've found - he can sneak under their counterspells and slow their tempo down quite a lot, and unlike against combo, you can actually take advantage of quite a lot of their cards.
Forsworn Paladin can reliably enable some synergies, albeit quite slowly (e.g. you get only 4 mana on Turn 3 if you play Forsworn Paladin on Turn 1). I think Forsworn Paladin's real competition is mana dorks like Ignoble Hierarch (and, even then, being mono-black has its advantages).