Oblivion Stone : This artifact allows you to put fate counters on permanents and then destroy those without fate counters, offering a degree of selectivity in what gets destroyed
If left unchecked Arlinn can win the game for you
As with the first one, this set has a ton of amazing card for kitchen table play, it's really Commander heavy, but there are also great cards for Type Four, multiplayer, Five Color, and general Highlander that will make my list as well
You may put that card on the bottom of that players library
One more was printed in Phyrexia: All Will Be One Commander with Otharri, Suns' Glory, and another experience counter legendary appeared in the Modern Horizons 3 Commander decks with Azlask, the Swelling Scourge