T: Add 2 to your mana pool. That's a land that would cause no end of trouble, and it would go in almost every deck with a respectable land count that could afford to run colorless land
Aura of Silence (T1, Ext, S, Block) Aura of Silence started out being a sideboard card that people gradually graduated to the main deck
Decks from any format (e.g., Standard, Expanded, etc.) can be played, but note that success in the game is based on overall damage output, so you may deal more damage, and thus have more success with newer cards (i.e., Sword and Shield onwards)
It triggers off a Dragon entering the battlefield under your control, so it plays great with any blink effects or reanimation strategies in addition to just casting it the old-fashioned way
In casual play, many groups are fine with proxies as long as everyone agrees up front.
The Lillie Premium Tournament Collection box is one of the most recent additions to this collection of valuable boxes, which explains why it isn't more expensive yet