Destiny Hero - Diamond Dude (DP05-EN003) - Duelist Pack 5: Aster Phoenix Unlimited

Once per turn, you can look at the top card of your Deck. If it is a Normal Spell Card, send it to the Graveyard and you can activate its effect during the Main Phase of your next turn. If the card is not a Normal Spell Card, place it on the bottom of your Deck.