Undying requires the creature to die and then it re-enter the battlefield per the cards instructions
I used to be tempted to play four, but Karl H in the UK scene convinced me - I believe correctly - that unless the whole deck is relying on Fork, this many is excessive
All in all, typical price action over the short term, with a long-term window demonstrating a healthy price trajectory
After all, three of four sheets (commons, uncommons and rares) are documented, there dont seem to be any artificial rarity differences, and the only information to add would be the raw data for the holos based on Youtube videos
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It puts Mega Gengar front and center in the art, making its darker color palette contrast with the bright neon colors from the rest of the scenario