The Shadowcreep Thrall looks like fun, but it also looks like it practically replaces the Deathstrike Thrall to me. A more consistent 4/3/2/1 spread is often better than one attack of 6, the move is higher, and the death isn't guaranteed here, either.
I'm not opposed to a slightly stronger Thrall in concept, but I'm not comfortable with the degree of overlap with an existing thrall and the Shadowcreep's main weakness in comparison (the small/medium restriction) doesn't sway me.
to review.