First up, at the cost of discarding another card, you can tutor any creature when Formidable Speaker enters the battlefield
Whats worse is that Sin cannot be permanently killed, as a summoner needs to sacrifice themselves to create the Final Aeon, a being that can temporarily slay Sin for a few years, before it returns once more
If you can't or choose not to, you sacrifice the permanent
Fun fact, this guy has a very weird background story in the video games related to a certain female idol
Instead of challenging characters, you just need to have them damaged for Robin Hood to quest for large amounts of lore
Finally, 2002s Legendary Collection was the very first set to include reverse holo cards and they had a firework style pattern that remains unique to this day