Greven's Rating system:
5.0: First pick no matter what. I will always play this card.
4.5: Splashable and first pick worthy.
4.0: First pick pack 1.
3.5: Early pick though not always a first pick.
3.0: Solid early/mid pick.
2.5: Solid pick in color.
2.0: Should generally make the deck if in this color.
1.5: Decent filler.
1.0: 23rd card if you have to.
0.5: This card will sometimes be sideboarded in.
0.0: I will never put this card into my deck (main deck or after sideboarding).

I think this is main deckable. 2.0, it's pretty close.

2.5

Considering there are 25 creatures in BFZ, not including tokens, that have a toughness of 1, this seems a really solid pick to me.

~SE++

I'm more in the 0.5 card camp. I played a few drafts so far, and there was only one game where I wished I had this. The things that come to mind are Eldrazi Skyspawner and the green ramp creatures

2.5 for me, though sometimes I start with it in the sideboard

I'm team 0.5 on this. I really don't like to main this effect, regardless of the format.

But it's versatile. You can cast it early to wipe scions, or use it as a creature late game, or sometimes even as an aura if you have other awaken cards.

But what it does at 2 mana is situational and what it does at 7 mana is inefficient. It's never 100% dead, but it's not that often that it's good.

It's definitely cuttable, so it's at best a 2.0