Welcome to the format! It's always nice to have fresh faces.
I was waiting for a Hero of Bladehold deck to pop up eventually! A powerful card indeed. Looks good, just might need some mana fixing, and you made one simple mistake. Oblivion Ring was printed as common once, so it is considered a common card. Thus you only have 2 of your 4 uncommon slots taken up by Overrun ! Enjoy the room to grow and tweak!