At the beginning of your upkeep, you may pay . If you do, return a creature card at random from your graveyard to the battlefield. It gains flying (This creature can't be blocked except by creatures with flying or reach.), trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.), and haste (This creature can attack, and as soon as it comes under your control.). Exile that card at the beginning of your next end step. If it would leave the battlefield, exile it instead of putting it anywhere else.