..If you just want a clock you could always mirror UW fish and run 2/1 guys for

(Jackal pup, goblin cadets, tattermunge maniac)
Grim lavamancer was commonly used back when UR fish was the "best deck"...It answers welders, aggro and the mirror.
Running less then four null rods is just a mistake in my opinion, you really need it to compete.
While brainstorm is decent, i probably wouldn't run it, i'd rather have some more disruption or more guys.
The UR fish decks of old won by card-advantage (Curiosity, standstill, LoA, ancestral recall), but i think just using a clock and enough disruption like UW fish is probably better.
/Zeus