Jorn is a fantastic card in an aggro deck: its ability to untap your lands lets you play pump spells to push through your opponents board, or you could just deploy your hand and quickly take over the game
It can kill almost any Planeswalker and most creatures, except for maybe the best blue card, Murktide Regent
Pluses being that they are rad, and that you'll get a surprise gift in the box
In fact, given this situation and the choke hold Garruk has on Liliana, the leg between her leg positioning helps to prevent escape and is functional
While all of them are a blast to pilot, the first two are the easiest due to Clouds versatile equipment playstyle and Yshtolas fun card draw/damage engine
And I do have to wonder if, intentionally or not, this card will act as a safety valve in metagames where spells are being cast through infinite mana engines and/or methods of cheating out spells through cascade