So, just to be clear, your goal here is to pump out enough damage to get the missing points, right? And, I assume, to run on auto?
Burn damage and poison damage are very sub-par for normal. Max-HP damage is similarly reduced in value, for the same reason. The big numbers on normal come from plain old regular damage. Also, normal Hydra is quite slow, so you want to just keep cheating extra turns. Unlike other Hydra teams you don't want to go all-out on speed. Here, you want to prioritize damage, but also not be too slow. On the plus side, you can almost entirely ignore defense/HP/RES/ACC.
- Soulless (big aoe damage + provoke)
- Razelvarg (leech + SPD up)
- Uugo (DEF down + block buffs)
- Brogni (ATK up + healing/shielding/etc)
- Your two best-geared champs between Ithos, Harima, Ronda, Yannica, and, surprisingly, Whisper