Nine Cards by Brick Tilley

One night at the Magic Castle, two young Germans showed this to Dai Vernon. Nine cards change to completely different cards with no hint of sleight of hand. A startling effect, it has the added plus of being in anybody's skill range, using only nine cards and no gaffs. You can customize this to illustrate whatever your imagination can devise.

The demo and tutorial videos will have you doing this in a matter of minutes.