The catch here is that Treasure Guardian, Protector of the Cave has an ability - called Who Disturbs My Slumber
That means getting an extra two mana, putting you at six, and starting with one spell already cast to trigger prowess
While cursing yourself may not initially seem the most beneficial, Lynde states that at the beginning of your upkeep, you can move a curse attached to you to another player, drawing two cards in the process
Snapback Free spells are good right
Expansion // Explosion is two cards that were built in tandem with one another
Ultimately while their role was somewhat minor in the grand scheme of things, they played an important role in laying some of the saga's groundwork and are absolutely deserving of better cards