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These are all on creatures that will trigger themselves for combat damage

#Pokemon20: The Pokmon Company's Tsunekazu Ishihara (YouTube video)

That was until I realized how great it would be in my Commodore Guff deck

Many cards have abilities that read, At the beginning of your end step, do [BLANK]. This is the last step of the turn where players can cast instants and activate abilities

That means theres a large cardpool and dozens of viable decks

The particular way a game rule is written can be copyrighted, so even using the same exact text (which would be necessary if one wanted the card to be tournament legal) could be copyright infringement