So I thought I would try my hand at the arena, it seems like fun. I loaded into a game and bought my first team member. Won the first round, got some paws. Bought another team member, another copy of my first team member. I thought they would automatically merge and make a 2⭐ team member but it didn't. Instead I just had two 1⭐ copies of the same critter. Do I have to unlock that ability, or is there something to trigger it that I need to do? I wasn't able to level up any of my teammates and ended up dying pretty early on. Hoping I can figure this out because it seems like a super fun thing!