If there was ever a card to work with Concerted Effort, it's this card. It essentially makes all your creatures unblockable and give them shroud. If you can play something like Oathsworn Giant, Akroma's Memorial, or Serra's Blessing and this has protection from almost everything constantly and with Concerted Effort out, everything you have is nigh-indestructible. While it is nice to have a 4/4 flyer that is unblockable and has shroud, there are some inherent problems to this card. First and foremost, if you don't have a way to give it vigilance or untap it during the declare attackers step, it loses its protection and evasion. Secondly, you can't equip it or enchant it in any meaningful way. Sure, you could use Giant Growth and then another instant to untap it to make it a 7/7 unblockable/shroud, but that's a lot of trouble to go through. But any enchantments or equipments will fall off it once it untaps.
Pros: Protection from almost everything all the time
Cons: Protection from almost everything all the time including your stuff