Overkill is Tidus doing exactly that
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)
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
Aura of Silence (T1, Ext, S, Block) Aura of Silence started out being a sideboard card that people gradually graduated to the main deck
In casual play, many groups are fine with proxies as long as everyone agrees up front.
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