It features the debut of a multi-colored leader card in red and purple
Additionally, if you go too far over 60, you might have trouble fitting your deck into one of those sleek Sidewinder deck boxes
Artifact lands are very popular in the format, as are many one and two-drop artifacts
Elminster Cost reduction is usually a tell-tale sign of a powerful card, and you can certainly build around Elminster to maximize its passive ability
All Treasure Making Discard to Draw Stuff There are a huge number of discard one, draw two, and then make Treasure tokens for future ramping and casting things that are great to add to your deck, especially in Highlander formats like Commander where you can run them all in the same deck
If those permanents have three or more card types each opponent loses three life, you gain three life and draw three cards