With its deep history in Magic's early meta, it is one of the most expensive cards period, not just in Arabian Nights
Id lean into legends that have powerful enters triggers so even if we lose Shaun later, we still got most of the value
The Egregious Unders Now be nice
The main consideration is that the deck needs sacrifice outlets and a stocked graveyard to make her engine reliable
Spell Pierce hits cards of any mana value and Flusterstorm is the best way to win a big stack battle thanks to storm, but Minor Misstep has some upsides too: it's a hard counter, so unlike Spell Pierce you don't have to worry about your opponent paying for it in the late game and resolving their spell and it can hit creatures along with spells, which is huge in a world where Ragavan, Nimble Pilferer is in one-third of decks
You should wait until you have Vito, Thorn of the Dusk Rose online, or something like this, and Cramped Vents becomes a removal spell plus up to 5 life loss for everyone else