Big Chungus

When Big Chungus enters the battlefield, 2 creatures the opponent controls are destroyed. You may also choose one land that will stay untapped but the mana it produces can only be used for Big Chungus. If you do, put a +2/+2 counter on Big Chungus.
{3}{g}{g}{g}{g},{ut}: You may put a +2/+2 counter on Big Chungus. If so, you must restrict the mana production of another land to Big Chungus.