Vanquish the Stowaways

When Vanquish The Stowaways enters the battlefield, each opponent creates three 1/1 black Vampire creature tokens with nightstalk.
{t}, Tap an untapped creature you control: Exile
target creature an opponent controls with power
less than that of the creature tapped to activate
this ability unless that player sacrifices a Vampire.
"Your kind is unwelcome here. Very unwelcome."