Ebon Paladin's Coming

Cast Ebon Paladin's Coming only if you control
three or more Vampires.
Flash
When Ebon Paladin's Coming enters the battlefield,
put a +1/+1 counter on each attacking Vampire
you control. They gain deathtouch and lifelink until
end of turn.
When you have no Vampires under your control,
shuffle Ebon Paladin's Coming into your library.