Souei, Shadow Stalker

{t}: This ability can only be used during combat.
Tap target creature an opponent controls,
it gets -2/0 until end of turn.
{x}{u}{b}: Create X copies of Souei, Shadow
Stalker with haste.
Copies of creature are non-legendary.
Each copy of this creature gets -1/-1 for each
other copy.
Exile all copies at end of turn.