1st brainstorm in 2nd buffoon pack, ante 1, first shop
2nd brainstorm by ankh in jumbo spectral pack, ante 1, second shop
3rd brainstorm by invis joker, ante 2, first shop
Negative brainstorm by ectoplasm in jumbo spectral pack, ante 3, second shop
Brainstorm in ante 4 shop, second shop, 2 rerolls
Ancient in buffoon pack, ante 7, first shop
(Also antimatter in ante 7 if you buy blank in ante 3)