Detox, Cleansing Wind

Flying, trample
{0}:You may reveal Detox in your hand, then you
may remove any number of -1/-1 from any
number of creatures on the battlefield. For each counter removed in this way, Detox costs {1} less.
Detox enters the battlefield with a + 1/+1
counters on it for every -1/-1 counters removed
when revealed before being cast.
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"He was once a beloved guardian."