unlike beneath the ground this can be shadowsteped etc. Verry strong value card. compared to beneath the ground you get an extra 4/4 for 1 mana which makes this a lot faster. And 4 slot is not verry hard contested i think this is a great card and will see play.
I think this will be included in new versions of Tempo Rogue. It's great against Priest, both because of the 4 attack and it plays around the new Priest AoE. It's obviously better versus control decks like Jade and Priest, but maybe slightly worse than Saronite Chain Gang in aggro and mirror matches.