Does lucky rabbits foot need to be declared to be used before rolling dice during a test? The RR states that effects that add dice or get an increase to the tested skill are selected before the roll dice step of a test. It does not mention components that reroll dice. However, in the manipulate dice step of a test it states this is when you use your chosen effects to reroll dice.

How has everyone been playing this?

You declare it after rolling.

Rules Reference 490.4b under Manipulate Dice would be the step:

Quote

You may use any number of effects of your chosen components to reroll dice or alter the results of the dice.

I just checked the card, and have something else to add to clarify.

You can choose to use it after rolling dice, but technically you need to declare it before rolling dice. However, if you declare before it but do not use it after rolling dice, there is nothing to stop you from using it later that round on another test.

So you may as well assume it is always declared before rolling the dice. Because it does not take up any hand slots, that is fine.

With items that take up a hand slot, you are limited in how many you can choose before rolling dice.