By "hard" i mean a way to get rid of creatures despite their power/toughness stats.
If you ask me, i do agree the card might've needed some reworking. But I wouldn't go as far as making it so unreliable/situational.
I'd go for something like:
Battlecry: Transform an ENEMY minion into a 5/5 Devilsaur
(maybe 4/4 if you think the higher cost plus lack of 1/1 option is too much of a nerf)
But I think it is unlikely that, once already announced, they'll take back that change.
So maybe, if the reason for such a rework is that the card saw play in almost every high end deck, there might be a way to fill the gap left by Tink without going back to the "must be in every deck" problem.
As it is, Druids relied on Tink to deal EFFICIENTLY with big minions such as Rag and Ysera.
Please note that by saying "EFFICIENTLY" i mean doing 1 for 1 'ish trades instead of having to use 2+ cards to do so.
My suggestion would be to rework the Naturalize spell since, in its current form, is too much of a disadvantage to be used.
I know it is "hard" removal for ONE mana, but giving your oponent 2 cards is very dangerous and likely to cause more problems than the minion we wanted to get rid of in the first place.
I'd suggest that the card be reworked as a Druidish version of hex/poly but not as good.
My take on a new Naturalize would look something like:
(Heck...even 5 if a "drawbackless" Druid "hard" removal sounds THAT bad)
Effect: Transform an enemy minion into a 2/2 Treant.
It is not as good (or easy to get) as Assassinate, Hex, Polymorph and the resulting Treant Cannot be directly dealt with the Druid's hero power (like Mages can do with the polymorphed sheep).
But it does get the job done, like Tinkmaster, without being a OP card with the "must have in every single deck" tag (which seems like its what drove Bliz to change nerf Tink in the 1st place).
Please tell me what you think.
(It would surely make my day to know what Blizzard thinks about it)
Any other suggestions and/or constructive criticism are welcomed.