It was designed by Ken Sugimori, the chief artist for the Pokemon franchise, and is considered to be one of the rarest cards in existence
You also need to still have that removal spell after facing a turn one or two Thoughtsieze and any removal your opponent might be playing to keep your own creatures, the ones you need to sacrifice to stop Vein Ripper, off the battlefield
He can be tough to beat via Bribery, so if you play a lot of one-on-one then it becomes more reasonable to trim him then as well
Graded Population Report: Zamazenta V #139 Visualize the distrbution of grades in the chart
The card draw is also kind of insane, with or without proliferate
In fact, a flashback spell like Increasing Ambition might be better if you skip casting it the first time and just discard it and flash it back for the greater effect