Tempest Efreet
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Fourth Edition Rare. One of the primary rules of
Magic is that you never put a card someone else owns into your hand. Unless you have a card
Tempest Efreet, which actually changes a card's ownership in the middle of a game. Although it doesn't involve ante,
Tempest Efreet is still considered an "ante card" for purposes of banning it from tournament play. You can see why.