Arbor Colossus [Theros]

Set: Theros Type: Creature — Giant Rarity: Rare Cost: {2}{G}{G}{G} Reach{3}{G}{G}{G}: Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.)When Arbor Colossus becomes monstrous, destroy target creature with flying an opponent controls.