Fleeting Strength

Remove all +1/+1 counters from all creatures.
Until end of turn, each creature gets -X/-X,
where X is the number of +1/+1 counters
removed from that creature this turn.
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"A little word of advice my master told me about
strength borne of magic: never assume that power
is your own. It can just as easily be taken from you."
—Barolden Vandroiy