This looks definitely like one of those official mythic rare green creatures that are really efficient and I don't notice they're supposed to be mythic rare until my eye wanders to the rarity symbol and back up to the cost and thinks "Oh, yeah. They shaved a mana symbol off there, so of course it is a mythic rare."

Whether that's about what you were aiming for or not is yours to know.

Those two abilities almost, but don't quite; go reallllly well together. But even against first strike, you can't flash this in indestructible, block, untap everything and there's the problem, it's now too late to do anything.

I guess it's a turn of vigilance on attack? But not the turn you flash it in? So again, doesn't QUITE gel to a single feeling.

So this ends up feeling a bit kitchen-sink now.

@Vitenka good point, I see how it's kind of tacked on... let me see if this helps.

Whelp; turning it into on ability is one way to link them. Kinda brute force, but it does work.

Each other creature? Right now it's ambiguous whether this untaps and gets indestructible as well

Why does this use "Those creatures" over "Creatures you control" anyway. Just muddies the water about whether only creatures that were previously tapped gain indestructible.

Thanks for the suggestions @SecretInfiltrator and @dude1818, will update.

@SecretInfiltrator I mostly choose to use "those creatures" because it's less text and I don't think it's that confusing.

@dude1818, it says "each creature" in case an effect an opponent controls causes it to etb tapped.