Cheyenne, Twice Reborn

Haste, Emanation. Cheyenne cannot be sacrificed.
When Cheyenne dies if Cheyenne is in the
command zone when this effect triggers you may
cast Cheyenne without paying her mana cost.
If Cheyenne isn't in the command zone she has
first strike and hexproof. If Cheyenne isn't in the command zone and dies, return her to the battlefield transformed.
"She isn't an easy one to kill." - Astrea