I guess it's hard to remove for some classes but like vs Paladin/Priest/Warrior it looks like a terrible card most of the time. Hunter they can remove it easily but they might not get something good(runs a lot of shit mobs or shit mobs they absolutely don't want to summon without other stuff like buzzard and tundra wolf), shaman/mage can remove it but they don't proc the deathrattle, warlock hard to remove too I guess especially in zoo mirror, in handlock I think they'd be pleased to see a mob with only 2attacks played on turn 3 and there's a lot of shit you don't want to pull out of their decks(but some are good like sunfury/argus/drake). Miracle it's annoying to remove but you can sap it and if you do remove it it has high chance to bring in a Leeroy or an Auctioneer(especially if you've cut farseers for example) so you can play around that instead.
Seems pretty gambly overall but if you're facing druid and zoo mostly it seems like a good card, and overall that's what most people play against at all times.