Many years ago I battled a Tamil list in DBM, with late western Romans. On paper I had all the advantages. But Elephants gonna Elephant!

I did win, and the Tamils did not do very well. So I can't say if "All of the Elephants!" (
TM) is a good tourney list or not. I suspect that having good medium or light infantry is a good counter. Also Artillery, though nobody sane uses that in a tourney list.....