For the first few years of its production, Magic: The Gathering featured a small number of cards with names or artwork with demonic or occultist themes, in 1995 the company elected to remove such references from the game
Ruthless Sniper: Pretty good
Though of course, once you've got Zack Fair, you're going to want his buddy too
Most of the time, the sideboard of the opposing deck needs to have an entire plan on how to beat Leyline, and chances are its not going to succeed at doing that to give you an example, at the Hogaak PT I lost to a person who mulliganed to three because one of their three cards was a Leyline of the Void and that invalidated my entire draw
Many other cards have also been revealed over the past several days, and continue to be revealed from several sources, including the official Disney Lorcana X (formerly Twitter) page and Mushu Report