There’s only 12 available troops for that combination - mostly not viable option either.
I made it to the Leaderboard on the last event and I’m sure those with more experience can confirm this, but that line up of green + centaur is really awful.
Like I said before, as long as it is not a Wildfolk or, even worse, Mystic (can be paired with Beetrix, and in the latter case with a bunch of empowered converters), it’s at least a way to bump lesser used types.
A bit surprised, they did not pick Raksha or Stryx yet.