"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
However, there may be better removal options available depending on the specific strategy of the deck, such as cards with additional utility or flexibility
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
Waste Not Turning discard into an engine is exactly what Waste Not does best
It uses the new Blood mechanic that doesn't have years of support behind it, and it's only got one infinite combo that doesn't inherently win the game on its own
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