Frej, God of Harvest

When you cast Frej, God of Harvest, exile it
unless it descended.
When Frej enters the battlefield, put a +1/+1
counter on up to five other creatures you control.
Descend — If you control five or more creatures,
you may cast Frej from exile without paying it's
converted mana cost. Exile Frej at the beginning
of your next upkeep.