Figured I should add this to the description instead of just replying in the comments section-
Basically you'll be holding a lot of these cards until the last turn assuming you draw Sera, but some can be played earlier such as:
-Cable (Angela/Sentinal/etc if playing those)
-Bishop
-CopyCat (depending on the ability she gains)
Other cards are more situational in the early part of the game:
-Mysterio if Bishop is already on the board and there aren't better options
-Nova if you know your opponent's deck lacks threats such as Killmonger
-Enchantress/Rogue and Shang Chi if it makes sense to
-Scarlet Witch in cases such as getting the dreaded Dream Dimension location, otherwise hold in case of Magik's Limbo
Turn 5 you play Sera, turn 6 is flexible as you can either play as much as you can to build your board while buffing your Bishop, and/or use your control cards to your advantage. Often ending with nova + killmonger to buff the rest.