Covers like this one by Dick Dillin. 
Or this one by Joe Kubert.
They screamed that whatever was happening inside would be so much cooler than all the other books on the stands, Buy Me Now! I didn’t buy either of these but the competition was stiff every month. Lots and lots of cool covers, even if the stories inside didn’t match up (consider the synopsis for “Blackhawk’s Reign of Terror“)
The prevailing view now is that we’re going to buy our favorites regardless of the cover. The cover art is correspondingly less engaging. It’s one of the few things where I really do think it was better back in my youth.
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