Odin, King of the Norse

When you cast Odin, King of the Norse, exile it
unless it descended.
When Odin enters the battlefield, create two 1/1
white bird creature tokens with flying and
vigilance.
Descend — If you control two creatures with
flying, you may cast Odin from exile without
paying it's mana cost. Exile Odin at the
beginning of your next upkeep.