Arbor Colossus [Commander 2015]

Set: Commander 2015 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.