Check out Metamox, MTG Goldfish, Quiet Speculation, MTG Price, MTG Scavenger, MTG Stocks, and StarCityGames to begin your quest
In fact we have enough cards that make and interact with Treasures now that you can build a whole EDH deck around them, and I can bet you that Xorn is going in every single one its currently the top red card from the set at 1600 EDH decks on EDHREC, and the third most popular card overall
Like Bob (Card not found) says, Greatness at any cost
For four mana, you can sneak this 3/3 Ninja with double strike onto the battlefield , meaning six damage is going to land on your opponent unless they have a counter or removal
The only way to get around this is to play cards that make face-down creatures
The numbering of each card is different from the numbering in the main set they came from