Very few copies were put into circulation - and now the corrected art version of the Dark Paladin is much rarer and more expensive
If you have a lot of large dragons - say, Ur-Dragon - then you can get a lot of power onto the table with this for just 3 mana
Cards like Lilo, Making a Wish and Stitch, New Dog were just two of the many cheap threats packed into the amber/x aggro shell, with the purpose of getting characters into play as fast as possible, and then using some number of Lanterns or shifting using Stitch, New Dog to get Stitch, Rock Star into play ahead of curve
You can run more in the sideboard, but you dont need more than one to start with since its super situational and youll only likely ever need it once if at all in a game
So, if youve never heard of it or want to learn more about it, lets take a look at the sweep keyword
He also leaves your opponent Poisoned , which is quite a strong status effect in this game when not many of them are floating around