Unleash the Hounds

Create two 2/2 Red Black Demon Hound creature tokens with Haste.
At the beginning of your end step, if you attacked with at least five creatures this turn, take an extra turn after this one.
At the beginning of your upkeep, if Unleash the Hounds is in your graveyard, create a 2/2 Red Black Demon Hound creature token with Haste.