Forum:Magician's circle help

-Magician's Circle Help-

(couldn't find an answer on the Forum:Magician's Circle page)

If it's my opponent's turn and he/she has one monster with an ATK of 1900 on their side of the field, and he/she enters their battle phase, and then declares a direct attack on me with that monster and I have no monsters on my field, but I have a Magician's Circle Trap card set (for a turn) and I activate it in response to my opponent's attack and bring out Dark Magician Girl from my deck with an ATK of 2000 using Magician's Circle's effect (opponent having no Spellcasters in their deck), does my opponent's attack still resolve doing direct damage to my Life Points? or is my opponent's monster forced to attack my Dark Magician Girl thus destroying their monster and decreasing their Life Points by 100? or is my opponent's attack negated or what? 89.240.109.161 (talk) 06:09, February 27, 2013 (UTC)