While the act of milling, putting cards from a player's library directly into their graveyard, can be used against an opponent as a win condition, the act of milling one's self can be quite advantageous if a deck is built around it
In fact, Knight Dragon has 2000 attack power like a high-level monster, and its own combat power is superior to Dark Sword, so it can be said that it is a pretty good card
But Sartoriuss Master of Destiny skill is something else that Duelists can rely on while using Decks with five or more different coin flipping card, including Desperado Barrel Dragon
Unlike usual Secret Lair releases, which tend to just be new art on old cards, these were brand new and mechanically unique cards
If it dies, it returns to the battlefield with a -1/-1 counter thanks to the persist ability, which you can remove the next turn with its own ability to reset the persist
Ken Sugimori's watercolor designs feature colored-in backgrounds