I value a random card at 1 mana. Card draw or discover is valued at 1.5 mana.
What value do you place upon a random card? How much should burgle cost to see play?
It has almost no value for laser focused classes like rogue actually. Rogue is all about having a game plan and maneuvering the game toward it every turn by planning ahead. Your cards and hero power are built for that. It's not any different for raptor rogue either.
Maybe this card is good for control style deck that you don't care you can't play the card you get anytime soon or ever even. Rogue is not that class, you don't have the health gain to play that kind of game. If this was a mage card for example, I could see the value but this is not mage or priest or whatever. It's not even good for a mid range rogue, you need stronger stats for a 2 drop. It's awful for tempo rogue.
Inside a bubble that when counting mana cost and value, the card is good. In context of rogue class, it's not any good.