Moonlight Reaper

Rally -- Whenever Moonlight Reaper or another Ally enter the battlefield under your control, create a 1/1 blue and black bird creature token with flying.
Birds you control get +0/+1 and have "{t}: Target player puts the top X cards of his or her library into his or her graveyard where X is this creature' s toughness."
"The crows' hunt begins."