I feel like I have three options for Satan.
1) Horus+Kirin. I wish I had Kirin or Ra, 4x just isn't enough here but I should still have a decent shot with max skilled Verche and Echidna.
2) Zeus poverty team with Siren, Echidna, Verche, Hera-Is. This is a crazy team that just might work. The hard part is charging up on a Kraken using Siren and Echidna. Once you get past that the rest is pretty easy, triple gravity takes boss to 2m HP, Siren to heal damage and then four turns to kill.
3) Goemon team with Echidna, Horus, Homura, Jotunn. This team requires 21k HP and a max skilled Goemon helper so I'm not sure I'll be able to field it. The idea is to take two hits on the first wave to have just over 3k HP and then use Jotunn skill (he needs some skillups) to survive the preemptive attack. Alternatively you can use a heart producer to heal up just before the hit, then you only need 18k HP but heart producers tend to have low HP anyway. If you stall as long as possible on each wave you should have time to charge a 17 round Goemon.