While Emrakul, the Aeons Torn still sees fringe play as a sideboard option in various decks to foil Mill strategies (among other things in Indomitable Creativity), Emrakul, the Promised End now sees the most play
The argument for yes is pretty decent too, though
Liliana was designed with a downside: you have to discard a card as well as your opponent
You can flip through the gallery below to see nine cards arriving in Jumpstart: Historic Horizons (including two reprints, one from Modern Horizons), and read on to learn how their new mechanics work and why Wizards of the Coast decided to take Arena this direction: Similar to the original Jumpstart, Historic Horizons cards can be added to your collection either by using wildcards or by participating in a timed event (ending September 9) in which you pick two themed packs from a possible 46, combine them into a single deck, and then compete against other players
Be a little more forgiving than you would face-to-face, and remind players of information that would normally be taken for granted, such as the power and toughness of a creatures, how many lands you have untapped, and what your life total isusing an app or whiteboard may be optimal