Culling Ritual is a decent board sweeper and ramp card, but we've got enough ramp and there are better sweepers out there
When it dies, it returns to the battlefield as Temple of Cultivation, which taps for a green mana and can transform back into Ojer Kaslem for 2G as long you control 10 or more permanents
Also, art has to be recognizable
Since then, however, sales havent completely died out, allowing prices to continually climb
The idea of protecting something originally meant to be used and enjoyed (be it reading a comic book or, here, playing a game with a trading card) can lead to different opinions when it comes to fan reactions to the concept of grading
Just some food for thought, but remember that basically every new set has new mechanics that tread new rules territory anyway (like mutate just a few months ago)