Yes, they technically have a mana value of 0
So while the card is always in the minds of Magic players for being very unplayable, it's also always in another part of their minds that the card may become playable one day
I tried to pick stories I haven't told, but there are a few favorites that I couldn't find written down in any articles that I might have told elsewhere (and it's just hard not to repeat anything with the amount of material I produce)
Yes, you can absolutely activate a creatures ability before it dies, assuming that you can pay the costs
Creature Artifact - Construct Myr Creature (CTRL to add secondary) Draw Saheeli's Directive Improvise (Each artifact you tap after you're done activating mana abilities pays for .) Reveal the top X cards of your library
Roaring Moon offers a lot of variants, and itll be fun to see it in action.