I just received it as a drop yesterday. I got it from Odji Sokkwi in the Hall of Champions. Also got Sokkiwi's Luring necklace of Skies, which gives two storm trap cards.
Wait a second, are you talking about the Mummified Deck? You don't have to get it from a drop. You can get it from the "secret shop" in Krokotopia Oasis. It is in that teleporter that lights up every once and a while. It will light when the gauge on the obelisks next to it is full. There you can buy it.
