If a cards ability affects cards in play, this only includes character and item cards currently on the table
1 Control As mentioned, through the paring of black and white, Orzhov has access to many of the strongest and most versatile removal in all of Magic
"Oversize cards" is not a "set" by the usual Magic definition, but I'd guess your online store categorizes them that way to make it clearer to customers they're buying an abnormal card
Waste Not Turning discard into an engine is exactly what Waste Not does best
However, there may be better removal options available depending on the specific strategy of the deck, such as cards with additional utility or flexibility
To prevent scalping of first-edition cards, it is impossible to tell if a card is a reprint, unless it has been errata'd and had its text changed between printings