It's between okay and good. Not "super wow OP". Just decent. That means it could see a lot of play, because it can fit into many decks and you can get some value out of it. But on the other hand it's no build around legendary, so that you can still play the decks if you are missing the legendary.
less tempo but more value than fandral. Easier to combine as well due to the 2 mana cost. The powerlevel entirely depends on what options are available, would be bonkers with a card like jade idol but not that good with current choose one card pool.
I think he's not necessarily weaker than Fandral, as you actual get more value, even though it's stretched out longer. A lot of the choose one cards that Fandral doubled on weren't a necessity (Nourish late game, for instance).
Now let's see the rest of the Druid cards to see where it's heading. :)
I think this will be VERY annoying in Wild, but not so much in standard. It is a worse Fandral Staghelm with a Nourish that now costs 6 mana and who needs a copy of a gain 2 mana crystal Nourish after you just jumped to 9 mana?
This may help a token deck with Power of the Wild, but unless this expansion gives some better "Choose One" options, this card is just Playable.
My gut reaction is this is bad. It's too easily removed, you'll only get one turn out of it before it's toast and I'm not sure any of the Standard spells are worth it. Unless Druid gets a killer Choose One spell in RoS I can't see it. In Wild it won't work with Malf or minions so Fandral is still better.
This is way worse than Fandral for many reasons, but mostly because its way less likely to survive a turn 4 5 play for a Nourish combo. Even if you do pull it off, Fandral essentially gets you two ramp and three cards for three four mana on turn 5 6. This gets you two ramp for the three four mana on turn 5 6 and then two more ramp and three cards for 8 10 mana on turn 6 8. Basically 6 8 more mana (and an two extra turns) for two more ramp.
EDIT: Forgot Nourish was nerfed! Have not seen a lot of Druids lately...