Justice League of America and Warlock
Back in the Silver and Bronze age of comics there were certain concepts and motifs that were repeated over and over.  One that I always thought was cool was "giant hand grabs hero/heroes".  I'm not sure where the trend started, but it almost always worked on me.  For some reason I always found it to be an eye-catching image, and those covers drew my eye right in.

The JLA squared off against Thanos before on the blog - First in STF #184 and then again in STF #931...