There are 2 things that are bothering me atm.
Gideon at mythic; Every single PW respectes the template 1 passive + 1 loyal ability if uncommon, 2 if rare or 3 if mythic. The only myhtic confirmed are Liliana and Tezzeret (the latter being BaB is considered myhtic by default) but Gideon is just speculated, thus as rare would make more sense.
Ugin is OP, he's on par with Bolas he must be Mythic, The colorless spot in the rare PWs maro mentioned is covered by Karn, so why can t Ugin be Mythic? Beside 3 Myhitc Pws in a pw mechanic set is really crappy