Black Blood Harden

If you control a creature named Crona, the Mad,
or Crona, the Fallen, you may cast this spell
without paying it's mana cost.
Target creature gains indestructible until end of
turn. If you control a creature named Crona, the
Mad, or Crona, the Fallen, it gains indestructible
until your next turn instead.
"This much I know: my blood is black." -Crona