Flight of the Flock

Bird's March--At the beginning of your upkeep,
if you control three or more Bird creatures, you
may exile Flight of the Flock from your graveyard. If you do, until end for turn, Bird creatures you control have "Whenever this creature deals combat damage to a player, draw a card."
Each player creates a 1/1 blue Bird creature token with flying for each card in that player's hand.