Hopefully, youre not trying to play the Purple Sengoku deck at max rarity because youll have to spend way too much money on a playset of each of the Admirals
Gix, Yawgmoth Praetor does the character justice, evoking Edric, Spymaster of Trest, but hurting people for drawing cards
While he can certainly perform admirably within the context of this precon, I believe that youll probably get more mileage out of this deck by replacing Szarekh, the Silent King with one of the other commanders if you plan to upgrade this deck to play in higher power tables
This and similar cards like Unexpected Windfall and Pirate's Pillage are technically card neutral, so they only count as card advantage if you consider Treasure as enough of a bonus
There's a really explosive things happening here, as I've played this deck as Mono-White, Green/White, and now Red/White