I would almost always play Master of the Wild Hunt in green because he is both a very high power level and able to offer you something you struggle to get elsewhere
As far as sweepers go, in a Gruul, Izzet, or mono-red deck, this is a great option, but since we're in Mardu, we can be a little pickier with our mass removal spells
They are listed around $40 on TCGPlayer, more than double retail, but unlike most big-box stores, they are actually in stock
Rayquaza is an often-coveted Pokmon throughout much of the franchise, with one player even taking 14 years to find a shiny Rayquaza
Then, whenever Alesha, Who Smiles at Death attacks you can pay two Black or White to bring a Creature card with two power or less back from your graveyard tapped and attacking
As a result, the passive ones take more work to successfully pull off