It also has a cool dice component (yes, luck-based)
(2022-04-29) Casualty N means As an additional cost to cast this spell, you may sacrifice a creature with power N or greater. and When you cast this spell, if a casualty cost was paid for it, copy it
Blue is the most common pairing for the preliminary Pirate decks, given that one-drop Siren Stormtamer serves as an excellent way to push damage through (thanks for Fell Flagship and flying), turn on raid, and protect critical Pirates (like a Kitesail Freebooter keeping Settle the Wreckage locked away mid-combat)
Rogue's Passage
Exile target card from a graveyard
For Yshtola, it came down to a mix of popularity of the character as well as being a spellcaster, her story and character development offered a wide range of abilities and moments to pull from to lead the deck