As Slimer enters the battlefield, you may exile two creature cards from graveyards. If you do, it enters the battlefield as a copy of one of those cards with a number of additional +1/+1 counters on it equal to the power of the other card.
"He's an ugly little spud, isn't he?"
—Dr. Raymond Stantz
NM-Mint Foil - $4.70
Lightly Played Foil - $4.20
Moderately Played Foil - $3.80
Heavily Played Foil - $3.30
Damaged Foil - $2.40
NM-Mint Foil Non English - $4.70
Lightly Played Foil Non English - $4.20
Moderately Played Foil Non English - $3.80
Heavily Played Foil Non English - $3.30
Damaged Foil Non English - $2.40