It's like Voidslime and Undermine had a baby
They can smash the idol, destroying an artifact in play, or they can lift the curse, destroying a target enchantment
Royal Assassin is one of the few Limited Edition Alpha cards to stand the test of time while 1BB is a hefty investment for a 1/1, the ability to snipe any creature which taps to attack at no further cost remains a potent deterrent
It also hits noncreature spells as well
To solidify their position as a fantastic new option for Aristocrats decks, Evereth, Viceroy of Plunder is also rather threatening
It does still see some play in Legacy, in Death and Taxes or Stoneblade, although it's not as much of a staple as it used to be a few years ago, to the point where some Stoneblade lists don't bother to run it at all