It would've killed the original golem as the main concept was that you could kill the opposing creature with it so your original half of your post has no point also with reverse time you still have to defend against the golem coming back and with antimatter it'll just grow back positive.
Hmm. So Reverse time and Antimatter are useless because they can be (gasp) countered by your opponent playing a card? Interesting logic, but let's try this then:
You have a fire bolt and a voodoo doll in your hand. Will you voodoo doll that golem AND use fire bolt on the voodoo doll? No, not if you are any good.
You have an oty even even more amazing hp and voodoo doll. Will you voodoo the golem and devour the doll? Nope. You would just eat the golem.
So why on earth would you use voodoo in the first place? Oh wait, that's right. Only Cremation is somewhat good with this card, so you would voodoo it and then cremate that creature for quanta gain and kill the golem.
Except that is a two-card combo, from two different elements. Where are cremations usually used? Rushes with small number of towers. When is the last time you had 6 or 4
in those decks? After 6-4 cremations/novas... ohhhh.