可以帮忙解释一下这张牌怎麽用吗? http://magiccards.info/ds/en/138.html Artifact, 3 (3) {T}: Add {1} to your mana pool. Any time you could mulligan and Serum Powder is in your hand, you may exile all the cards from your hand, then draw that many cards. (You can do this in addition to taking mulligans.)1 Illus. Matt Thompson Gatherer Card Rulings (UNDER REVIEW BY WIZARDS DUE TO THE RULE CHANGES) 12/1/2004: You can use Serum Powder's second ability only while it's in your hand. If this card is in your hand, you can choose either to mulligan or to use Serum Powder's ability. Using the ability doesn't prevent you from taking further mulligans, and taking a mulligan doesn't prevent you from using a Serum Powder's ability if you happen to draw one. 12/1/2004: Unlike a normal mulligan, Serum Power lets you draw the same number of cards that were in your hand, not one less. If you have already taken one mulligan and your hand contains six cards including a Serum Powder, you can choose to remove those six cards from the game and draw six new cards. 12/1/2004: The hand is removed for the rest of the game; it isn't shuffled back into your library if you take another mulligan. Cards removed from the game are always face up unless the effect that removed them says they aren't. Be sure to return those cards to your deck for your next game. Format Legality Legal in Vintage, Legacy, Extended Banned in Standard Printings (1/8) Darksteel (Rare) --

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