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Darksteel Juggernaut card

The relevant part of the rules text states:

Darksteel Juggernaut's power and toughness are each equal to the number of artifacts you control.

When is Darksteel Juggernaut's power and toughness determined? Can they change?

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2 Answers

up vote 13 down vote accepted

I am not a judge, but I believe the following sections from the comprehensive rules cover everything:

207.2a The card may have a characteristic-defining ability that sets its power and/or toughness according to some stated condition. (See rule 604.3.) Such an ability is worded “[This creature’s] [power or toughness] is equal to . . .” or “[This creature’s] power and toughness are each equal to . . .” This ability functions everywhere, even outside the game. If the ability needs to use a number that can’t be determined, including inside a calculation, use 0 instead of that number.

and

604.3. Some static abilities are characteristic-defining abilities. A characteristic-defining ability conveys information about an object’s characteristics that would normally be found elsewhere on that object (such as in its mana cost, type line, or power/toughness box). Characteristic-defining abilities function in all zones. They also function outside the game.

And if you check the card rulings for Serra Avatar (with the same ability), it has the following ruling:

10/4/2004: Its power and toughness are continuously calculated.

So, its power and toughness are always defined, in all zones, and always updated. If anything needs to reference its power and toughness, determine what that is. If a new artifact comes into play, it automatically goes up in power and toughness.

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Thanks for the thorough response. That was just the answer I was hoping for. I plan to play Darksteel Juggernaut in my myr deck, so it's good to know I can easily increase its power and toughness. –  joshdick Nov 9 '10 at 3:35
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Personally, I'm going to keep asking Magic questions on this site for as long as you guys keep providing such great answers. –  joshdick Nov 10 '10 at 20:15
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I haven't played MtG in quite a while, but I would assume the power and toughness change as the number of artifacts you control changes. For example, if you had no other artifacts in play when you played Darksteel Juggernaut, it would come into play as a 1/1 (I'm assuming an Artifact Creature counts as an artifact). If you later played two more artifacts, it would become a 3/3. So basically, whenever you need to know what the power or toughness is, you count the number of artifacts at that time.

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