For Mirror Box, that rule is the legendary rule that says you're only allowed one copy of a legendary creature card on your battlefield at the same time
There's plenty of wiggle room with individual nonlands as well
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It makes it a decent cantrip by fixing the hand in the starting turns of the game, and later can be an enabler for combos in an Archlight Phoenix Jeskai deck or in an Esper Reanimator list
Given as a trophy card to finalists of the Pokmon World Championships held in Anaheim, California during August 2006, in order to claim the card, players had to gain entry to the tournament by collecting enough points to qualify and then make it into the finals of their divisions
Dobra platforma stawia na edukacj uytkownikw, dostarcza narzdzi kontroli i nie naduywa skomplikowanych zapisw w regulaminach