unreal prism
Baron and Mine are both availble in the shop (Baron ante 1 and mime i think ante 8 and above)
Perkeo is somewhere between 4th and 8th ante in a spectral pack
sorry for not remembering exact spots :)
no idea how far this run can go so give it a shot
some extra stuff - telescope ante 1 & 2 idk if it can lead to observatory tho so feel free to experiment