Shocks and fetches and fancy duals are great to have, but they dont add that much to your win percentage
Ayara, Widow of the Realm Ayara, Widow of the Realm and Ayara, Furnace Queen both lend themselves well to aggressive strategies
Being the focal point of a combo deck makes it a prime target for being banned immediately, holding the record for being the fastest ban after its initial release in the history of Magic
It doesn't copy whether that creature is tapped or untapped, whether it has any counters on it or any Auras or Equipment attached to it, or any non-copy effects that have changed its types, color, power and toughness, and so on
Duke Ulder Ravengard can grant myriad to another creature, while Legion Loyalty hands it out to your whole board