I don't like Bob in affinity. You drop your hand fast and he just slowly refills it. Often times you just need a quick boost to finish off the last bit of life. Thirst for Knowledge is great here. Redundant lands, Moxen, Memnites can be discarded for reach.

If you are going on explosiveness then don't you think Shrapnel Blast would help? I have found this to be great.