I like this.
Yay 
I'm not sure about the "stackable", though.
I assumed blobs kinda formed together to become a giant blob.
How does it react to a Rewind? It rewinds only a single blob?
Oh gosh so powerful, yet so awesome! I need more feedback on this idea.
And suppose you have 5 blobs (so, a single 5|5 blob)... and you strike it with a lightning: it destroys only the top one or all the five blobs?
Also so powerful yet so amazing! It seems it would be impervious to everything!
And what about devour? It should add a stack to it, i think.
Oh man you're right, I forgot to add that in...
And what about being devoured?
I think it should be able to be totally devoured because it's one big blob mass.
If every spell destroys only a "blob counter" it's more original and reflects the sturdyness of blobs (at least in japanese rpg...), but this way it seems a little OP, i think.
Interesting concept, but it needs to be detailed.
But i definitely support it! 
From what it seems, if I add any of these things, the cost would need to go up as well. I do like them all very much though!
Moar feedback for this!
EDIT: Removed Devour ability. Now has a Blob Counter functionality.
