Local groups are of course welcome to modify to fit their own needs, and if youd like to play those cards in an unfamiliar environment, please secure the permission of the folks youre with before the game begins (and please be gracious if they decline)
Mime for advanced play
With Vorosh, in theory a bit of biding your time combined with an Unblockable enchant(of which blue has tons) can build up to a time walk effect wherein you kill a player before they can even react
Callidus Assassin Clones are fun, especially in Commander, where everybody plays wild threats
In the early turns, it functions as a removal spell, ramp element, graveyard hate piece, and card selection spell all wrapped in one
Lastly, bargain hunters can expect to pay below $30 if you're looking for an HP copy