Shaddin Darkon

When Shaddin Darkon becomes targeted by a
spell an opponent controls, it phases out. This
ability triggers only once. After Shaddin Darkon
phases in, he gains Indestructible until your next upkeep.
Whenever you cast an instant or sorcery spell, if
it doesn't cause you to sacrifice a creature, you
may sacrifice a creature. If you do, either
copy that spell or counter another target spell.