360 Legacy Cube, no cards that have never been in Standard (No Commander/Archenemy/Conspiracy/Horizons products)
I tend to remove cards I feel are power outliers (fast mana, most Tinkers), spells that end up costing effectively zero mana (Treachery, Fireblast, Snuff Out) as well as cards that led to unfun play patterns (Moat, Tabernacle, etc)