A variation on Naturalize and Glissa Sunseeker's ability. It's not the best, but it does fit the theme I'm going for.

We need a naturalize, and this is spot on. Good.

Yikes. Quite hard to use. Can't ever kill something on-curve when you're on the draw (i.e., if the opponent casts a 5-drop artifact on turn 5, you can't kill it with this even if you've hit all 5 land drops. Well, unless you've been accelerating.)

Inspired me to wonder if we might want cards like Sunseed Hedgerow.

Haha. I do not suggest it, but we could have abilities like ": Add to your mana pool. You may not use this mana to cast spells or activate abilities."

also, you're right. It didn't occur to me how hard this is to use. In fact, I'm pretty sure if you added "Draw a card" it would be close to fair. Well. I guess that would probably make it cost more.

Yeah, this is just... poo. It looks like it's one cheaper than naturalise; but that's only if you are casting something with all the rest of the mana. It's usuall: ­: Destroy target enchantment or artifact with CMC X. Add to your mana pool. And clearly that second clause is all too often going to go to waste.

Could be made competitive at, say X+2, setting aside my other complaints about fiddliness of tracking.

With "Draw a card", it starts to remind me of Repeal.

Cantrip instead of +2? Works. Lets you not worry so much about putting it in a deck where it might be useless. (Let's you worry instead about whether you should hold onto it or use it up to get rid of it, especially if there's some not-wonderful target to use it up on...)

V: Heh. Rending Vines had those decisions, and was quite interesting for it.

What if it was "Destroy target noncreature, nonland permanent..." plus a cantrip? It's still difficult to use, but at least then it's versatile.

Hmm... most of the versatility of Rootgrapple came in being able to occasionally hit lands. With the CMC restriction we probably do have to exclude lands. But at that point the only other option is planeswalkers, and, okay, yeah, it's good to have some planeswalker answers at common, but it's pretty nasty wording to say "target noncreature nonland permanent". I think it's a lot easier to read if it says "target artifact or enchantment".

Plus, in fact, in this set white has a lot of enchantment creatures, so it'll be great against white if it has the Naturalize wording.

That's true.

Agree on the rootgrapple stuff being good things. Disagree on letting it destroy lands. Unsummoning them to hand is bad, destroying completely is too nasty for something which can, even if only sometimes, be cheaper than naturalise. Heck, it makes it a no brainer. You end your turn? I have green up? You don't have an artifact I really need to kill? Kill a land, draw a card. My turn? Far too good.

Letting it hit plainswalkers - well, I'm all in flavour of everything being allowed to kill plainswalkers for free. But it does clutter up the card a bit.

I don't know. Green doesn't usually destroy non-flying creatures, and I don't see why it would have any particular hate for creatures with plainswalk. ;)
Anyway, I do agree with Alex. With white having enchantment creatures, having this be able to destroy them is nifty.

What if this was and said "Destroy target artifact or enchantment with CMC X or less. Add X green mana to your mana pool"?

Just changed the card to reflect what you said, Link, and moved it to the Uncommon Sheet. Let's see if we can get new legs out of this. BTW, I like how this helps out mono.