Steal your opponents creatures, attack with them, then possibly keep them permanently with the help of Bazaar Trader.
If you are unable to permanently keep my opponent's creatures through Bazaar Trader, there are several sacrifice outlets which compliment with the overall goal of the deck, including Hazoret's Favor which increases attacking power, or Fling or Collateral Damage for some direct damage. Finally, Culling Dais allows for cost free sacrifice, and a means of supplementing my hand late game.
Lastly, there are two interesting cards in this deck that are worth mentioning, because they are cards that I don't see in other decks of a similar theme: First, Monastery Swiftspear compliments the overall theme of this deck being instant/sorcery heavy due to constant prowess triggers, and provides early game board presence. Second, Bedlam Reveler facilitates quick draw to replenish my hand mid-game, and is easily cast given that instants and sorceries in my graveyard reduce its CMC. Additionally, its prowess makes it a significant threat.
In the event that you are facing creatureless deck, or if you simply wish to throw your opponents for a loop, this build can use a complete sideboard swap to shift mechanics, and can transition into a burn deck. For this sideboard swap, I remove the following cards from the mainboard:
4x Mark of Mutiny
4x Wrangle
4x Claim the Firstborn
2x Culling Dais
1x Mountain
However, other swaps may be considered, based on the context and opponent. I should concede here that, when the sideboard is switched in this deck to transition it into a burn deck, it is imperfect, and less efficient that other builds in circulation, given the fact that the sideboard of 15 cards cannot wholly replace the mainboard mechanic of stealing creatures.
Thank you for reading this, if you've made it this far. I welcome any recommendations that stick with the theme and budget, and look forward to all feedback.