Grunhild, Vengeful Squire

When another legendary creature dies, place a
Knight counter on Grunhild, Vengeful Squire.
Creatures with Knight counters gain the Knight subtype and have First Strike.
{b}, {t}: Target creature gets -X,-X until end of
turn, where X is the power of Grunhild,
Vengeful Squire.
{3}{w}{b}: Exile target creature. Activate this ability
only if Grunhild, Vengeful Squire is a Knight.