Combo decks, aggressive decks like Hammer Time, and 4 colour grindy decks all like having access to the card for multiple reasons
Bouncing back to your hand isn't as bad as sacrificing a creature, but the effect still sets you back in a big way and can be followed up with a nasty counterspell
Sisters of Stone Death I'm not sure about you, but I find it odd that a gorgon doesn't have deathtouch
This is certainly true in the case of Blex, Vexing Pest: a Lord for not just Snakes, but also several other niche creature types as well, including Bats, Spiders, and Insects
In the more constructed style cube things however this card is all sorts of powerful and interesting
Our own list runs very few noncreature cards so these hatebears barely affect us at all, but severely slow down our opponents, allowing our werewolves to flip out and murder them