Restricted
A player cannot have more than two cards with the restricted keyword in play under their control at the same time.
A player can play or put into play a restricted card even if they already control two restricted cards. However, if a player ever controls more than two restricted cards in play, they must immediately choose and discard from play restricted cards they control until they have only two in play.
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The restricted keyword is equivalent to the following triggered ability:
"Forced Response: After you take control of this card, if you control more than 2 restricted cards, discard all but 2 of those cards."