Uri, the Hound of Chorde

{x}{x}{t}: Roll {x} d6 and tap any number of creatures with converted mana cost equal to
or less than the result
{ut}: put a stun counter on any creature
tapped by Uri, the Hounde of Chorde
{ut}: Sacrifice Uri, the Hound of Chorde and destroy any creature tapped by Uri the
Hound of Chorde