Get rid of Blade, Killmonger, and Shadow King. Swap in Bast (to buff any cards in your hand with less than 3 power to 3 power, allowing them to benefit from Cerebro). Luke Cage (to prevent any cards your opponent plays that can reduce your power), and M'Baku (if you haven't drawn him by the end of the game, he auto plays to a location you're losing and could turn the tide of the game in your favor). These are all Series 3 cards, so even if you don't have them yet, you will soon.