ugulu: [sblock] Well, straight up fighting is out of the question because of the DR 20/Magic . . . unless you burned the wish on greater magic fang (might as well add extended to that or some other metamagic feat though I'm not sure what would help). Other alternatives to GMF for the wish are:
extended (+1) Hide from Dragons (Wiz7) - if you want what amounts to a surefire draw)
extended (+1) maximized (+3) Fell the Greatest Foe (Pal3) - +18 damage on every attack? Cool, but it doesn't even overcome the DR
Extended (+1) Transformation (Wiz6)-another cool one but still no way to overcome DR/Magic
But, first things first is that you need to summon help. As you may have noticed in the Evil vs. Good arena, demons/devils are much better with help. So:
1. Bring in a cornugon. The cornugon should then cast dispel chaos.
2. Bring in a cornugon. The 2nd one should cast dispel chaos while the first battles 20cc.
3. Both cornugons are now engaged, so use meteor swarm.
4. Use wish->GMF and join the fight.[/sblock]