So you can never run out of trades....you can run out of boosts but you'll always have 2 normal trades.
And here I was stacking my team for Round 4 now.
So only really need to plan when to use boosts. I'm thinking
- early to get the right cheapies / team set up
- if you are stacked with a team whose favourable draw comes to an end and you want to get out quickly
- injuries