Reyterra,Breaker of Demons

Flying, first strike, resist black(Prevent all damage
from a black source dealt to this creature.)
Each creature you control wth a +1/+1 counter on
it has demonslayer. (Whenever this creature assigns damage to a Demon, it deals double damage instead.)
{4}{g}{g}:Put a +1/+1 counter on each creature you control.