Adam, Unabsorbable Blob

Whenever a spell or ability would target, deal
damage to, destroy, or fight Adam, exile it's
source with a Goo counter on it.
Adam's power and toughness are equal to the
sum of the CMC's of each spell in exile with a
Goo counter on it +1.
When Adam's power is greater than 25, he pops! (Destroy Adam and return each spell with a Goo counter to the stack under it's owner's control in
a random order.)
"Uh Ooooooh!"