Protection from blue (This creature can't be blocked, targeted, dealt damage, or enchanted by anything blue.) Whenever Goblin Piledriver attacks, it gets +2/+0 until end of turn for each other attacking Goblin.
Throw enough goblins at any problem and it should go away. At the very least, there'll be fewer goblins.
NM-Mint - $3.70
Lightly Played - $3.30
Moderately Played - $3.00
Heavily Played - $2.60
Damaged - $1.90
NM-Mint Non English - $3.70
Lightly Played Non English - $3.30
Moderately Played Non English - $3.00
Heavily Played Non English - $2.60
Damaged Non English - $1.90