<P> Planeswalker cards' uniqueness rule was heavily influenced by Legend Rule . The only difference is they refer to the type of the card . This basically eliminated any possibility of having two same Planeswalker under a player's control as each different Planeswalker is assigned with a one unique Type for all cards refer to the same person . The only exception, however, is if a Planeswalker is also represented by a legendary creature as two rules are operated independent to each other . For example, Karn, Silver Golem and Karn Liberated can be controlled by a player at the same time even though they represent the same person . </P> <P> Legendary creatures and lands were introduced in 1994 with Legends, the game's third expansion set . Although some cards printed prior to Legends represent unique individuals and would logically have been legendary, they were and are still treated as non-legendary . The first legendary artifact, Sword of the Chosen, was printed in the Stronghold set in 1998, and the first legendary enchantments were printed in Champions of Kamigawa in 2004 . </P> <P> The way the legend rule functioned when it was first introduced differed from its present form: if a legendary card came into play when another copy of the same card was already in play, the recently played legend would be put in the graveyard, but not the one that was already in play . This could be a significant advantage to the player who played the legend first, and was particularly an issue with legends that could be played cheaply and quickly, such as Lin Sivvi, Defiant Hero . </P> <P> Initially, legendary creatures were printed with "Legend" as their creature type . At the time, most creatures other than artifact creatures (which had no creature type at all) could only have one creature type, so "Legend" replaced any other creature type they might have had . Later, some legends were printed with additional text giving them extra creature types: for example, while Barrin, Master Wizard has "Legend" as his creature type, the card's text reads "Barrin, Master Wizard counts as a Wizard", effectively giving him the Wizard creature type as well . Beginning with the Urza's Destiny set in 1999, legendary creatures were simply given multiple creature types: for example, Rayne, Academy Chancellor is simply printed as a "Wizard Legend", making the "counts as a Wizard" text unnecessary . The status of "Legend" as a creature type could be exploited using the card Unnatural Selection: a player could eliminate an opponent's creatures by changing them into Legends, triggering the legend rule . </P>

Mtg how many of the same legendary cards in a deck