Warwick the Howler

Haste, Menace
Disturb: {2}{b/g}{b/g}, sacrifice a creature
At the beginning of your untap step, don't untap
Warwick the Howler unless you discard a card.
When Warwick the Howler is blocked, it gets
Double Strike until the end of the turn.
An opponent that can block Warwick the Howler
must do so.