The Master Key prize cards were handed out to competitors in the 2010 Pokemon world championships
Which is to say, they created a new in-game economy that didnt work very well, so halved the number of cards you receive to fix their mistake
Quite often, Konamis archetypal cards are basically a combination of the unique archetype mechanic + 1 of these, for each monster, since the monsters are usually the most searchable type of card in the deck, and the most easy to both use and be countered, making them more fair than spells/traps
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on top of all of that, it has a bit of text that reads: Whenever a creature you control with deathtouch attacks, each opponent loses 1 life and you gain 1 life. That means that not only are you going to poison your opponent, youll also drain them of their life
You can only use each effect of "Laughing Puffin" once per turn