A Dragon card is a card with the creature type Dragon in its type line. Similarly, a creature on the battlefield is a Dragon if it has the Dragon creature type. A card that has "Dragon" in the name (such as Dragon's Fire) isn't a Dragon card unless it also has the Dragon creature type.
If you chose a Dragon you control, use that Dragon's power as Dragon's Fire resolves to determine how much damage is dealt. If the Dragon you chose is no longer on the battlefield as Dragon's Fire resolves, Dragon's Fire will deal damage equal to the power it had the last time it was on the battlefield.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Campbell White
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