Alrighty, Snorlax.
Well, he has an interesting set of powers that work together. He can heal for 2 counters three-quarters of your turns, which is nice. Doing two damage between every turn would add up to a nice 40 for no energy, but there's that chance that he'll wake up, which is kind of cruddy.
Unlimited--Too weak, I give it 3/10
Limited--It's decent and REQUIRES NO ENERGY, so it's going to fit well into any deck. 7/10
Modified--There's not a lot of Grass metagame going on right now, but it doesn't require energy and has a weakness to Fighting. Still, I can't see it getting much play because there are better cards that are less "flippy". 5/10
Personally, I *might* use it, but there are so many better cards out there.