A card that allows you to see who cast the last undercover voodoo targeting you

i see the point but undercover means, undercover.

maybe as a preventative measure, cast and for 24 hours any undercover cast on you you will see, but as for looking at who cast on you a day ago defeats the purpose of undercover.

I agree with 42 to a degree. Undercover is meant to be undercover, nothing should change that, otherwise undercover would be useless.

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Agreed.

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maybe within a certain time period, like no more than 5 hours ago?

Undercover means undercover period. There's already the fame limitation, what more do you want?