Both of these Locations don't have a unique ability, but they ease the player into using them by being cheap, ink cost-wise, while also gaining you one lore at the start of your turn, so long as the locations stay on the field
Invasion of Dominaria Invasion of Dominaria Battle Siege (As a Siege enters, choose an opponent to protect it
Kethis, the Hidden Hand is a perfect commander option for those looking to build a deck that incorporates a multitude of legendary cards, whether they be creatures, Planeswalkers, or other types of permanents
Thanks to surveil and jump-start, Standard decks are pretty good at getting cards in their graveyard, which means you can use Angel of Grace as a weird lifegain spell from your graveyard without ever casting it by discarding it to something like Chemister's Insight or surveiling it with a Doom Whisperer or Dream Eater
Discovery / Dispersal Discovery was an overpriced Preordain, which is probably good enough with the upside of being able to cast Dispersal later in the game to answer a key threat