Jeskai Shrinekeeper
They can use those cards to turn them into big damage
Those shot up in price after launch and are still selling for as much as $1,200
Also, you're only able to trigger them when you put the land into play, not on an opponent's turn, but they do gain you a life rather than cost you one
You won't find value in it every game, especially if you're effectively controlling the board with all of your direct damage tools, but if you find it at just the right time you can gain a two, three, or even four lore instantly, which is often enough to close out a match in a deck like this
Sapphire Emerald Also Has Late Game Threats to Challenge Your Opponent The longer you can keep up the Mother Gothel/Aurora DM situation the better, enabling your characters to safely quest or take strategic challenges against your opponents characters