Vex, Mourning Wyvern

Flying, Infect, Menace, Rampage 2
Vex, Mourning Wyvern's power is equal to the number of creature cards in your graveyard.
Vex, Mourning Wyvern has defender as long as you control no other creatures.
"That beast's howls? You'll never hear a more heartbreaking sound." -Local Innkeeper