Timing limit seems weird. [This] Might be too good if you could also use it during an opponent's turn.

I considered adding a mana cost, but when the card's cmc is 8 mana, that just sounded too rough.

Yet another fossil card that says "Play non-fossil". This is a very odd mechanic. Still, at least this one powers up other fossil stuff.

An interesting epic-like thing. I'm not sure the difficulty of getting it going is worth the upside it gives; but that's what testing is for. It's certainly splashy.

The big problem, I think, is that to use this you need to be practically creatureless. Because you need a couple of decent fossil spells in your graveyard (ideally, something that deals damage, and something that draws cards) and a pile of non-fossil instant/sorceries in your hand. And to be at 8 mana... it's just really hard.

And the upside is... 3 casts of some really fiddly spells that tend to mainly punish opponents for playing fossil?

Well, the idea is that you get two turns, right? And that acions during one turn fuel the other turn, so the whole theme is about having cards of both fossil and nonfossil variety.

Which this card actually encourages: You need both to a fossil nonpermanent card and a nonfossil nonpermanent card to even use this.

That makes this rather demanding, but three copies is really much.

I hate that this is so ver the top and expensive for a normal rare. Its a waste in Limited where playing just enough noncreature cards to make (some) prowess triggers worthwhile can be a challenge. Now you add a layer of A/B mechanics on top of that and make it an eight mana do-nothing monster that sometimes just explodes the game state?

That's a mythic if I've ever seen one.