Who do you think is a Underrated Hydra Champion (and why?)
I recently started using Rian Seacrest (Rian the Conjurer) on my Brutal team and he's been doing surprisingly well. First off, his A2 is a 3 turn CD and gets you your AOE Weaken while also doing a Buff Strip that bypasses Poison Cloud. His A1 doing Block Buffs is a really good supplement to your AOE Block Buffer. His Revive is only Single Target but usually that's all you need.
Overall I feel he's a good counter to the Wrath head. Wrath Head puts Block Debuffs up and is the most likely head to kill champs on your team so the Revive keeps you in the game. You can manual his A1 so that if a head respawns right before Poison Head takes a turn, you can get that Block Buffs up again immediately.
The fact he's a champ you're guaranteed to get early from Doom Tower is pretty huge.
SIDE NOTE: The first 4 Doom Tower Normal Epics you get are really good for any new player. It's a shame how poor the DT Hard leggos are till you get Varl. I hope they get looked at soon to be re-worked to match the power creep that has happened.