Nightmare Duelist

Double strike, absorb X, where X is its power.
(If a source would deal damage to this creature,
prevent X of that damage.)
Whenever Nightmare Duelist attacks or blocks,
put a -1/-1 counter on it at the beginning of the
next upkeep.
Cursed (When this creature dies, distribute its -1/-1 counters among one or more target creatures you
control.)