Perci, the Silver Occultist

Pack Tactics - When Perci, the Silver Occultist
attacks, if you are attacking with creatures whose
total power is 6 or more, place a +0/+3 counter on creatures you control
{t},remove a counter from Perci, the Silver
Occultist: draw a card
{1}{u}{b},{t}: Transform Perci, the Silver Occultist
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There's something menacing about her silver hair