Serenity, the Ruiner of

Flying
When Serenity, the Ruiner of enters the
battlefield or attacks, goad all other creatures. A
creature's controller may pay {2} to protect it
from this effect.
At the beginning of each end step, create a 2/2
Fury creature token with "Sacrifice this creature:
add {c}{c} to your mana pool" for each goaded creature that attacked this turn. Up to two tokens
can be created this way each turn.
"Pray for aid, the angels will bring peace."