Slay Belles, Demon Carolers

Haste, dismember ( Whenever this creature is
blocked, put a -1/-1 counter on the blocking creature
and create a 0/1 colorless Appendage creature token.)
When Slay Belles enters the battlefield, choose an opponent for the season of giving. Whenever a
player casts a spell or activates an ability, the
controller of this creature may change the target
to that opponent or one of their creatures as a
target instead. Targets must be legal.
"Tis the season of giving..."