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This could very well be the reason we see various shades of the grey stamps

Savior of Kamigawa later gave us mirrored pairs in creatures that increased your maximum hand size by one or two and creatures that reduced each opponents maximum hand size by one or two (as depicted above)

Speed Duels continue to grow with the GX Duel Academy Box, introducing a ton of new cards and Skills into the format

I see this making its way into many artifact and Eldrazi decks

Prior to Maximum Crisis: Special Edition , for cards with PSCT, Quick Effects are normally noted by " During either player's [turn/Phase/Step]" in the activation timing, or " (this is a Quick Effect) " at the end of the effect if that wording is not applicable