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This won't touch generic mana costs or other colors, and it only works on permanents, which was clearly done to keep them from getting broken by casting free Brainstorms, counters, Lightning Bolts, Swords to Plowshares, etc

[10] Every Pokmon card has a symbol on the bottom that indicates its rarity, so some gold cars are more rare than others

Skullclamp is particularly famous for the seemingly-innocuous change during development from granting +1/+2 to +1/-1, while also reducing the Equip cost to a single mana

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This means that if you cast Syphon MindSyphon Mind each other player will discard a card and the caster draws for everyone, not just the enemy players opposite that player