In addition, some details, like the way in which the torch reacts to the infrared light, are starkly different between the two cards
Let the Galaxy Burn uses a neat quirk of the rules to make its play, as X spells change their own mana value while on the stack, meaning the effective cascade cost of the card goes up the higher X is
For example you may want to build around Elminster because you love that character and the obvious choice would be to build around his abilities which involve scry mechanic, big spells, tokens and flying theme or even combinations of the above
Gogo, Mysterious Mime* Gogo clone just wish you were more interesting than a middling clone that is undersized when not copying things on attack, even if you can copy legendary creatures 118
It may see some play in Gruul Fatty decks as well, such as Xenagos, God of Revels, where trample could be very helpful