Daenas, The Night King

Whenever you cast a black spell, you may pay {b}. If you do, create a 1/1 Black Vampire creature token.
Whenever you cast a red spell, you may pay {r}. If you do, create a 1/1 Red Werewolf creature token.
Whenever you cast a blue spell, you may pay {u}. If you do, create a 1/1 Blue Zombie creature token.