Odin, Rider of Sleipnir

Whenever Odin, Rider of Sleipnir attacks, choose
one —
• Destroy all creatures defending player controls
. with converted mana cost 3 or less.
• Destroy target creature defending player
. controls with converted mana cost 4 or greater.
At end of combat, if Odin attacked this combat,
its owner shuffles it into their library.