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
You can learn about how card condition affects value and a full breakdown of the most expensive cards by rarity tier, Those will help you make a better choice before any future trade or sale
In English, just about anything that goes on your foot that isn't a sock or isn't sock-like is a shoe
You do still need creatures for The Great Henge to draw cards, but it even helps you play the creatures so that you can draw more creatures
The deck is simple and solid, with a clear plan thats great for new players
Look, it doesn't have haste (unless you've got Anger in the graveyard), but it is a serious threat to anyone on the table