K'taya of the Choir

Deathtouch, Lifelink, Choirbane
When K'taya of the Choir enters the battlefield,
you may sacrifice any amount of permanents, and
they become Choirs if they are nonlands, and Choirsongs if they are lands.
You may cast Choirs and Choirsongs from your graveyard.
All cards which have a name that contain the
word "K'taya" get +x/+x, where x is the number of choir and choirsong cards in your graveyard.