If the Bloomburrow set has artifacts, the Sword of the Meek seems like a perfect fit
Each opponent loses X life, where X is the number of creature cards in your graveyard
While this could change at some point in the future, especially if Wizards of the Coast actually puts the work into MTG Arena to allow new formats in the game, we're not expecting that to be the case any time soon
Whatnot works especially well for: $1 starts Bulk singles Mystery lots Pack openings Slabs with active bidding Buyer giveaways Repeat-show communities Moving inventory quickly But here is the honest truth: Whatnot is not passive
The rest of the deck goes along with the Kindred Pirate theme of getting all sorts of Pirates in play and attacking until your opponents die
Its a little funny that none of those card types are assassin when they come from the Assassins Creed set, but that doesnt mean they arent one of the coolest new vehicle commanders or pirate commanders to hit the scene