With a wide board and cards like Merrow Commerce to untap each turn, you can easily drain libraries while still applying pressure on the battlefield
It could be used to destroy any monster with 1500 or more attack from the field, hand, and drawn from the deck
Every Angel must be compared to Baneslayer Angel (3 White White 5/5 Creature Angel Flying, first strike, lifelink, protection from Demons and from Dragons), and Archangel Avacyn is not at that level
Being able to place even more giant bodies onto the field is always a super satisfying feeling, and this can be done repeatedly since your Xyz monster here has 4 whole materials
So thats what you get, but what is the function of a Play Booster in MTG
-Cast zinc alloy inlaid with hard synthetic color enamel