Nyris, Rahgthasi's Messenger

When Rahgthasi's Messenger enters the
battlefield or attacks, create a 2/2 black and red Rahgthasi Servant Creature token.
Sacrifice a Servant, add one mana
of each color of that creature's mana value.(For example, a creature with mana value {1}{b}{b}{r}
would give you {1}{b}{r})