Arbor Colossus

Reach\r
{3}{G}{G}{G}: Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.)\r
When Arbor Colossus becomes monstrous, destroy target creature with flying an opponent controls.

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 this creature becomes monstrous, destroy target creature with flying an opponent controls.

Commander 2015

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.