Freylyna, Hatred Perfected

First Strike
All Undead Creatures that share the colors of Black and Green, they also have First Strike.
If Freylyna, Hatred Perfect or a Undead Creature you control kills a creature, add a +1/+1 counter to Freylyna, Hatred Perfected.
When creatures block Freylyna, Hatred Perfected, they have -1/-0 until your turn is
over.