I use Blackaria as a helper, can summon her at the start and again around 7 million points or so. I usually have lost a couple of units at that point, but I don't have the ideal setup for Hydra on my priest (need more attack speed, but have no luck with earring drops).
Doubt Ur is going to do you much good if you have Bloodwind and Llywelyn. He's pretty crappy at Hydra since he has no AOE, but he hits really hard and attacks fairly quickly, I definitely do better with him on my team than Greysoul, but that's not saying much since he's really gimped in WB. Stacking Ur's defense down with Bloodwind's would probably be alright on Golem if you don't have Llywelyn.