When it enters the battlefield, it can bring back an instant or sorcery with cycling from your graveyard, so its a natural fit for decks built around that mechanic
They would ensure the retailers had access to the products on this day, ready to go and by offering a specific day and heavily advertising it, therein lays a promise for that particular point in time
Against some decks, it will be amazing
Having a card that will trigger multiple times on each of those actions can sometimes feel like a Rhystic Study is in play
However, if that hand promises a stellar setup upon hitting your third landlets say youd have an 80% win chance with a timely drawthen keeping is more appealing
If your deck can cope with having weak cards (ie lots of card advantage or quality) and also recover tempo well then Daze is fantastic, if not then you need to really consider if it offers you what you need