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
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
2015-11-04 If there are additional costs to cast a spell, or if the cost to cast a spell is increased by an effect (such as the one created by Thalia, Guardian of Thraben's ability), apply those increases before applying cost reductions
From Accursed Witch to Zombie Infestation, we have 500-ish choices
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