Miku... Comfortable Skin

Changeling
When you cast this card sacrifice a Miku card, if you don't sacrifice this card instead.
Whenever you sacrifice a Miku card Miku... Comfortable Skin becomes a copy of that card
with this ability "X: This card becomes a copy of target Miku card in your graveyard or in exile. X
is equal to target cards converted mana cost - how many times this ability has been activated."