Withering Dread-Knight

Flanking (Whenever a creature without flanking
blocks this creature, the blocking creature gets -1/-1
until end of turn.)
If a creature an opponent controls would get
-X/-X until end of turn, where X is greater than
0, put that many -1/-1 counters on it instead.
(For example, if a creature would get -2/-2 until end
of turn, put two -1/-1 counters on it instead.)