Genomancer goes on to say that they need to make a final ruling on it. For the time being, let's not argue about whether or not it's legal. I'd rather just get people's opinions on the deck.
Here is my list that uses Marrow-Gnawer for a general. I'd say that the strategy should be pretty self-explanatory. Play all your Relentless Rats and smash face, or drop Tendrils of Agony after playing all the rats.
According to Genomancer of the EDH Rules Committee, you can, at least for now.
2. Ghandi = Angus Mackenzie
3. Robocop = Bosh, Iron Golem
4. Gandalf = Hisoka, Minamo Sensei
5. Mario = Brothers Yamazaki (Luigi Included)
General: Marrow-Gnawer
Creatures - 40
38x Relentless Rats
Artifacts - 11
Other Spells - 15
Lands - 33
24x Swamp
More to follow.