[Trumanator]

Note that namad included the suggested dominion as well. Immortality is also unbelievably good to have on a rainbow since he's much harder to kill. Finally, like he said, the fish ammy is 1W in the most commonly used mod, which most of Baalz' guides are written using.

All that said, there's nothing that says you can't take an archmage of course. Baalz generally encourages player adaptations.