While I think Aragorn is great and he should certainly stay in this deck, I prefer to leave owyn as the Commander, as she is better at taking advantage of the decks Human synergies
It's a classic tutor, but if you have spell mastery (two instants or sorceries in your graveyard), you also get a rebate of 3 black mana
If players have any cards in hand that allow actions to be taken with them from a players opening hand, the starting player takes all such actions first in any order, followed by each other player in turn order
Whats most dangerous about this deck, overall, is just how well you can stack your Blight counters, and how cards work together to enhance their impact
The fact that it is a single use card also makes it a better card design, it will not slow down games overly and it will provoke more difficult choices