Man, so strange there's never ever been a thread about this topic. Certainly not one that I can remember.
Does anybody have any ideas for how to support Golem tribal in a cube environment?
I agree on Unearth, but your Sigil evaluation seems super optimistic. I've never run it, so I can't say first-hand, but I have difficulty imagining my aggro deck spending 6 mana to get +2/+2 on a single creature.
No, the next lyric is "I've been a menace, for the longest". This is the oldest menace, unless you count Bestial Menace, which isn't a creature, so was promptly disqualified from consideration.
Yeah, I've been doing the same. I think I just have it floating around in some unclassified section, but it is definitely cubeworthy. I mean, it's vaguely in design space of Electrolyze, while requiring a bit more setup and planning to get value out of.
Also, you can combine it with...
Cursed Scroll for all intents and purposes is a red 1-drop. I wouldn't be averse to filing it as such (with consideration for what type of removal you want this type of effect to be exposed to).
There are a ton of sacrifice outlets. The problem is that decks wanting a 6-drop creature usually don't want them. My RB Aggro / Sac decks almost always top out at 4 or 5. Goblin Bombardment doesn't slot into a control shell.
Further, cube pod decks tend to top out at 6 CMC. You're just...