Killer Queen

Deathtouch
When Killer Queen enters the battlefield, you
may search your library for a card named Sheer
Heart Attack and put it into your hand.
As long as your life total is less than half of
your starting life total, Killer Queen has
"{t}: Search your library for a card named Bites
the Dust and put it into your hand.
As long as you control a card named Sheer Heart Attack or Bites the Dust, Killer Queen
isn't a creature.