Sleipnir, Odin's Stead

Sleipnir, Odin's Stead cannot be countered.
Haste, Trample, Protection from Blue and Black
{p/g}{p/g}{p/g}: Sleipnir, Odin's Stead gains Doublestrike until end of turn. Creatures dealt damage by Sleipnir, Odin's Stead that would enter the graveyard this turn are exiled instead.