It tends to see a spike whenever enchantments and are popular, and its quite interesting that this is as cheap as it is, in comparison with its green cousin
It only recently dropped down again thanks to a reprint in Outlaws of Thunder Junction
(3) Once per turn, during the End Phase, if the previous effect was activated this turn: Return this card to the Extra Deck, and if you do, Special Summon 1 "Sharpedo, Abyssal Predator" from your Extra Deck, GY, or banishment
I remember the versions before the redesign looked like that, but the new ones in the thread are joint art with a different one emphasized
He also was kind enough to write the creature's power and toughness, so that if it gets into combat, the math is easier