Rogues is a very strong deck in Historic and Dauthi Voidwalker would slot right into a Modern version of Rogues
Thats still the case for the recent remake, Final Fantasy Tactics: The Ivalice Chronicles, though the baseline difficulty has been ratcheted down somewhat from the '90s version
It boasts a remarkably low PSA 10 population compared to Sword & Shield era cards
Then, it can place a Crystal Beast monster from the deck in the spell/trap card area, and then the player takes no damage from battle afterward
Given that almost all the cards in the deck are limited, you will need to improvise a lot and play around your own mills and hands
Then River Song deals damage to that player equal to its power. Being able to make River Song stronger when players mess with their deck is one thing, but being able to also hurt players for doing so is excellent