Blinking effects are very powerful, especially when you are allowed to abuse enter the battlefield effects such as Derevi, Empyrial Tactician, Karmic Guide, and dozens of others. He’s a solid card that for only 5 mana is a 4/4 vigilant trampler which is pretty relevant. Having a blink ability on him, as well is great. I’m not sure I’d use him as a Commander myself, but he’s a very good option and can become quite a Voltron general if you can load him up, because that trample and vigilance truly makes a difference!
All in all, Roon is a great creature for any Bant-themed (green/white/blue) Commander deck.