If you wanted to make it harder you could say that: right before the start of the game, the enemy team may ‘ban’ X characters from the list.* So, you should rank enough teams as choices, that
a) They’ll be able to pick a team, whatever is banned
b) That team will do well together.
*The list you were given for the enemy team is what they’ll pick after your team issues its ban (they know what they’ll ban in advance).
If you wanted to make it harder you could say that: right before the start of the game, the enemy team may ‘ban’ X characters from the list.* So, you should rank enough teams as choices, that
a) They’ll be able to pick a team, whatever is banned
b) That team will do well together.
*The list you were given for the enemy team is what they’ll pick after your team issues its ban (they know what they’ll ban in advance).
I won’t say I didn’t consider it, but the last one of these I made was somewhat too complicated, so I’ve tried to make this one more approachable.