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when you get about 75%+ of the entire print run (unique not saying 75 of every /100) of all his cards, you will be getting close.
I'd say it depends on the player...if I had 75% of Todd Van Poppel's cards (I'm actually at 99%) that's not really a "supercollector", but if somebody had 50% of Derek Jeter's cards they would be an insanely giant super megacollector.
Richard
Which Van Poppel are you missing LOL