This is Amazing Stories for December 1956, cover by Edward Valigursky. The ISFDB entry for this issue is here. I found this version of the cover at Pulp Covers. You can download and read the issue at the Internet Archive.
Pulp Parade #295: The Galaxy Master doesn’t look he’s in control of much
On the upside (for him), he appears to have two lovely minions, who are concerned enough for his well-being to drag him away while he’s having his villainous breakdown.