If you have to many attack dice, you might remove a poop(The games terms not mine!) one so that you come across better dice more often.
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Well a poop is AMAZING because if you upgrade it once it turns into The Holy, which is a 6 attack every time! But it does require that upgrade. However I think maybe some boosts might not be helpful by the end. Especially an un-upgraded one. And upgrading a boost only upgrades from 1/2 chance of it being a 1 to 1/3 chance of being a 1, while introducing the 3.