We finished playing today; we played a while ago so I don't remember the details too well. Birds spawned on the first week. On the second week, I took the external bird dwelling. Massed a large stack of birds. There were also 3 Griffin Conservatories (9 angels) at the respawn. Captured a Dragon Utopia. Broke through the GO. Captured his castle around the 4th week, and then the chase began; one of his castles had a GM5 with Dimension Door, which ultimately helped me keep up with him. He had Wings, Portal, and Dimension Door. In the end, on turn 224, I caught him and killed him without mana.
Thanks for the game.