Absolutely I will choose Clarissa for dark even though she is Paladin, but who is better for my yellow, Joon or Sif? And how should I put the position?
I would make it dependent on your war defense. Does your Alliance allow a yellow flank?
Reason is that I would put Sif as flank, and Joon as wing.
I really like to go up against Telluria & Co with purple. With Sif you’d give me a hard time.
If you’ve maxed Joon (congrats!), it now becomes a question of who’s the best support hero for you to level up for offense. And that is a more challenging and interesting question.
It would be good to know more about the rest of your roster, but since we are talking about support, in the abstract, I would go with Malosi due to his speed.
If you’re already maxing Clarissa, then I think I might wait for another purple? Are there other options on your roster?
Sif is a good flank to Telly, but I would choose her only if you would not have vela or gm. I have found that putting either of the two to wing significantly weakens the defense, gtv needs to stay together in the middle. And Sif is not suitable in the wing.
Thus I also recommend Joon and Clarissa for the wing positions. Costume Vivica can be considered for healing wars into the left wing/corner.