Random Generator gave me Monk Realist and Alloy Golem. Alloy Golem was always underwhelming, so stealing his stats was fine. I don't know about giving Black and Red the ability to Tranquility, but, in theory, that's what artifacts do. It seems that people have a real problem with artifacts that destroy enchantments, but not other artifacts that break the color wheel... for example Blazing Torch. I don't know. I do know that this somehow still feels wrong, but I can't pin down why.

Seems fine to me.

I do like this card.

You're correct - both that this is breaking a very tough rule in letting red and black destroy enchantments, and also that people are inconsistent about it compared to more or less every other effect. Nobody minds letting blue get +X/+X with Junkyo Bell, or letting white discard with Specter's Shroud, or letting black doublestrike with Fireshrieker, or even letting green get flying with Cobbled Wings. And rare artifacts are allowed to blow up any permanent (Lux Cannon, Argentum Armor, Spine of Ish Sah, Reaper King, Ratchet Bomb).

So yes, it is a very illogical taboo. It's more logical to break it. But it is still a taboo so you're technically stepping outside current design philosophy.