Mirajane,Sitri-demon

Flying,Deathtouch,First strike,wither, protection from white and green.
When ever a creature is destroyed by mirajane, sitri-demon you may pay {r}if you do she gets a +1+1 counter.
Pay {x}{r}{b}{t}deal x damage to target white or green creature damage dealt this way cant ne prevented and they cant ne regenerated.
I am the strongest of all three of my forms.
~mirajane, sitri-demon.