A different approach to boosters/ blocker prizes
The current set up of winning certain boosters/blockers doesn't really work for several reasons, not least you've no idea what board you're playing when selecting which booster, the quality of your opponent, the number of moves you'll have to activate these more powerful boosters, etc. It's pot luck and i suspect most people use them when trying to complete a streak, only to be frustrated on the newer boards that they don't get activated.
Instead I have an alternative idea. You win in the chests 'super boosters/ blockers' which are like wild cards - you can select any of the boosters/blockers once it's been activated. So going into an important game you can use one of these prizes and then use the best booster or blocker for the moment.