A common line of play will be to resolve All Hallows Eve, and then to activate Bazaar of Bagdad three times before the All Hallows Eve effect takes place (tapping Bazaar once on the turn Eve is cast, once on the next turn, and finally again on the next upkeep before the last scream counter is removed)
Dire Undercurrents is also capable of creating some potent sacrifice loops alongside Nadir Kraken
It was bigger, at around 7.8 million total cards
They do run Scapeshift as an easy route to victory, but it just complements the gameplan
Sisay, Weatherlight Captain is an established deck in that format, and this card seems like a slam-dunk there
I like to give my other legends prowess in my legends deck in any format as what I see as the most obvious use case for Bria, Riptide Rogue