Some troops in arena are very straight forward. Atlanta deals damage to all enemies. Yawn. What’s your favorite troop to use that makes you feel like you’ve done something splashy, exciting, or difficult to pull off?
Mad Prophet is a favorite, because he gives everyone 5 Magic (huge in Arena) and costs a whopping 18 Purple.
I like Lucifria because she’s the only troop that can burn all enemies guaranteed. Dimetraxia can, but only 75% chance to do so, and he does scatter damage, whereas Lucifria is single target (you can usually pick off the lowest enemy then with the burn damage).
Ice Witch is a fun one because she gives 3 Magic to allies if she can manage to kill an enemy (I believe she does 10 damage). If you set her up right to get that killing blow, you can cascade lots of damage out of her.
Mist Stalker is a better version of her, because although he only gives himself 3 magic if the enemy dies, he deals true damage, so it’s easier to get the bonus. You can’t target his ability though, it hits the weakest enemy.