Hibernating Bear

Hibernating Bear can't attack or block as long as
it's not monstrous.
{3}{g}{g}: Monstrosity 2. (If this creature isn't monstrous, put two +1/+1 counters on it and it becomes monstrous.)
When Hibernating Bear becomes monstrous, it
fights target creature you don't control. If that creature dies this turn, you gain life equal to its toughness.