Doumu Shé, Cellestial Empress

Endow {b}{b} (If you cast this card for its Endow cost,
it's an Aura spell with enchant creature. If enchanted
creature would die, instead destroy this Aura.)
First Strike, Immortal (This creature cannot take
damage, cannot have counters, and cannot change its
power or toughness)
Enchanted creature has First Strike and
Immortal.