Here's an Impel DC Cosmic trading card featuring CMMH! favorite Adam Strange:
I'm not sure if the "Heroes From Beyond" label applied to a certain set of superheroes, i.e. sci-fi superheroes like Adam Strange or Captain Comet, or all DC heroes, but it would interesting to know.
While the obverse of the card is all Silver Age silliness, the reverse hints at the Bronze Age changes which Adam underwent during the Man of Two Worlds story arc:
Hooray for calling it a rocket pack and not jet pack!