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Regular cards didn't fit in these small boxes

At the end of the day its generally best to just look up legality on scryfall if you have any questions, and theres always the possibility that theres an exception to a rule explained above

Furthermore, that stat line led this Portal Three Kingdoms card to be a rare rather than a common, as it likely would be today (if it were even printed at all with such a vanilla ability), and explaining this cards over-$60 price point in the secondary market

You can do this at instant speed too so if you need to pump up a blocker to trade or want to give your attacking creature trample depending on how your opponent blocks, you can set up a number of different plays

Other cards are legal where already available in other formats