[CoN] Karkoth & Rain of Colorless Fire

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Greetings to all Nerath & D&D Fans.

My Question: When I play Rain of Colorless Fire,so it must be in Draw Phase. Thats Clear. But it this effect immediate, or in the Fight Phase ?
If the effect is immediate, so it´s Player can again fight against the Target. If this is so,the Target is a City, it is not to defend. (Except Dragons.)

Thank you !!!!!!!!!!!!