[Astroking112]

Having now played the game, I'd argue that both the Necro-Alchemist and Lantern Geists are at least an A, if not an A+.

The Necro-Alchemist has a nasty ruling from Hasbro that you can remove multiple markers per turn to further increase his attack, which lets him get up to a base attack of 9, potentially one-shotting a Planeswalker. Even if he misses, though, I've found that properly defending him and doing a burst of spells brings him back up to full charge in minimal time, letting him devastate another figure all over again. Honestly, I feel like the charge marker ruling kind of breaks him, albeit I haven't played with all of the colors yet to see if they also have such a super powerful unit.

As for the Lantern Geists, they bring an insane value for only 30 points. 4 life with 4 defense is tough to burst through, especially when they can fully heal themselves and reposition every time that your Planeswalker takes a turn. They might not have any great offensive potential, but they excel at tying down key targets to defend more costly units. That's also before taking into account the great deck control that they give you over your opponent, which would be pretty good on its own. The Leyline Phantoms are also good, of course, but these guys can be far more frustrating and take up far fewer points.