This is Halloween

Black creature spells cost {1} less to cast.
Whenever a black creature enters the battlefield
under your control, you may pay {b}, if you do
create a 0/1 Pumpkin token with Defender.
Sacrifice 3 Pumpkin tokens; Search your library
for Jack, The Pumpkin King and put it onto the battlefield under your control.
"Come with us and you will see, this our town of Halloween!"