Sparky isnt a bad option but yes, Domino would be worth 4/55. I see you have a Massacre as well so get him 3/45 if he isnt already. Lastly, look for a power control or immune or damage over time champ for your second 4/55
Definitely take her up...unless u are planning to bring her into act 6,u don't need 5* versions of the other two of the trinity so even a 3* version would do...along with her take up massacre upto atleast 3/45...along with being a part of the trinity,he is a fun champ in himself and would pull his weight as a 3/45 in Ur questing teams
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If u have the rest of her trinity