So green cards and cards with green mana symbols in the rules text are out, but everything else is allowable
Many collectors would be happy to have this in their collection because you do not encounter these errors too often
If you want to stop someone from getting a Clue token, you have to counter the spell or ability that causes them to investigate in the first place like countering an Expose Evil, or using a stifle effect like Disallow to stop a triggered ability that would make a player investigate
The other problem with finks is that it is almost always a 1GG or 1WW card what with Selesnya being pretty uncommonly seen (although still more common than Jund less explicably)
collectors wanted new cards, not reprints, and Team Rocket arrived two months later anyway
Mirror Universe Much like #4 above, this card's cachet value is in the past