Pointed Discussion

It's just not worth tapping three creatures for this, when there are cards that can do the same work for 1 mana and no creatures tapping.

Only 3 Cards have a CMC of 1 and "destroy target artifact or enchantment":
Dispeller's Capsule, but you have to pay an additional 3 mana to activate it and it's white, not green;
Molder, but only a CMC=0 card can be destroyed this way;
and Nature's Claim, but I don't want to give my opponent those 4 life.
This card is way better than all those and in a fair amount of decks, it's even better than Naturalize.

And, you only need to cast it with convoke when you have the spare creatures. With one or two creatures, you already make it as cheap or cheaper than Naturalize.

Pretty neat. You can play this after your opponent's battle phase. So you tap all the creatures that you can tap and 80% of the time you cast it with 1 mana. Not to mention that with cards like khalni garden and Nest Invader convoke requirements are met quite easy.

A heavily underrated gem, perhaps from being among all the other convoke stuff. It's an instant so you can cast it at the end of your opponent's turn if you're really worried about having blockers. So 99% of the time it's as good as naturalize and 80-90% of the time it's better. Note that convoke can reduce the cost to 0, not just G, if you tap a green creature. 4.5 stars for being the best card in MTG for what it does except for aura shards. And then only if there's more than 1 serious threat to take care of.

I'd almost always choose naturalize because in order for this to be better you need to tap 2 or 3 of your own creatures, effectively stalling your whole turn just to use a removal spell. Still, not all that much worse than naturalize, worthy of 3.5 stars

I'm always amused when people aren't able to understand how Convoke works, and how it's supposed to be used.

This isn't a Naturalize that you have to tap a creature for. This isn't a 1 cmc Naturalize that you have to tap 2 creatures for. This is a FREE naturalize when you need it, that you CAN tap creatures with summoning sickness for. I.E. those dozens of tokens you've made but can't attack with this turn because you're Selesnya and that's what you do.

This + creatures that cost hybrid green mana = mono-black(or red, or blue) deck breaking the color pie.

@Doragonshinzui: It's never free. It costs at least G which is important. I'd always rather have Nature's Claim.

@lifegain

Read Convoke again:
"Each creature you tap while casting this spell pays for 1 or one mana of that creature's color."

So as long as you have three creatures with at least one being green you can have a free naturalize.