Pulp Parade #294: Meet me in the vortex, Louie

Pulp Parade #293: The girl who loved death
Pulp Parade #295: The Galaxy Master doesn't look he's in control of much

This is Amazing Stories for July 1950, cover by Robert Gibson Jones. The ISFDB entry for this issue is here. I found this version of the cover at Pulp Covers, which also has a version of the same cover but with a different color scheme:

You can read and download this issue at the Internet Archive.