When Thriving Grubs enters the battlefield, you get {E}{E} (two energy counters). Whenever Thriving Grubs attacks, you may pay {E}{E}. If you do, put a +1/+1 counter on it.
Near Mint - $100
Lightly Played - $100
Moderately Played - $100
Heavily Played - $100
Damaged - $100
Near Mint Spanish - $100
Lightly Played Spanish - $100
Moderately Played Spanish - $100
Heavily Played Spanish - $100
Damaged Spanish - $100
Foil Prices
Near Mint Foil - $100
Lightly Played Foil - $100
Moderately Played Foil - $100
Heavily Played Foil - $100
Damaged Foil - $100
Near Mint Foil Spanish - $100
Lightly Played Foil Spanish - $100
Moderately Played Foil Spanish - $100
Heavily Played Foil Spanish - $100
Damaged Foil Spanish - $100