Pony MADness · 1:50am Aug 9th, 2014
In the very front of Al Jaffee's ridiculous MAD Fold-In this month (#529, dated 10/14), there's a pony. Looks like a G1 pony, though the logo doesn't match, and the cutie mark is five dollar signs arranged in sort of a cross.
(For the record, Jaffee was older when G1 debuted than I am now -- though not much older.)