Warden of the Forlorn

Whenever a creature enters the battlefield under
an opponents control, Hinder 2.
Warden of the Forlorn gets +1/+1 for each -1/-1 counter on creatures you don't control.
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Prisoners of the Orzhof aren't forlorn for their crimes.
They are such as the debt they owe can never be
repaid, placing them in prison for eternity.