At the very least, it's certainly trying - in a deck with ways to make Bear creature types stronger, Kudo ensures every creature will benefit, while it can also disrupt strategies that want to hone in on creating a strong board presence with lots of built-in stats
The long and short of it is that because the static ability of Ashes of the Fallen changes the creature type to Lhurgoyf before Disa's triggered ability goes off, the combo does indeed work, and it can provide a massive power boost to the Graveyard Overdrive deck
If you need to destroy creatures, look for Sword of Fire and Ice
For the past few months, it has been firmly in the top tier of the format and at times has been the number-one overall deck in Modern
His low ranking here is due to his lack of protection against him attacking you, unlike some similar creatures
While this usually works out to be between 4 and 6 cards, if you play fewer creatures, dont be afraid to add more board wipes to keep more creature-heavy decks off your back when needed