Ride of the Valkyries

Return all creatures from your graveyard to the
battlefield. Creatures you control get flying, first
strike, indestructible and haste until end of turn.
At the beginning of your end step, exile all
creatures you control.
The Valkyries go weaving with drawn swords,
Hild and Hjorthrimul, Sanngrid and Svipul.
Spears will shatter, shields will splinter,
Swords will gnaw like wolves through armor.