Maiden in Black

At the beginning of each upkeep, you may cast
Maiden in Black from your graveyard.
{x}, {t}: Exile up to X target creature cards from graveyards. Put a +1/+1 counter onto another
target creature you control equal to the total
power of cards exiled this way.
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"Go forth; touch the Demon inside me. Let these
ownerless souls become thine own."