Triggering a battlecry is such a powerful ability, that they moved dreamer’s embrace to T5, but shudderwock gets to trigger a battlecry, for free, EVERY turn, from turn 1.
If this costed 1 (or even 2 or 3), or had some kind of restriction, like 3 times per game, or cost increases every use (like elise’s hero power), it would still be a top tier pick.