When using Japanese flea market listings, you can sometimes utilize the support or inquiry lines on the proxy purchase service side
As if that wasn't already good enough, you can also sacrifice Knights' Charge in the late game to return every Knight creature card from your graveyard to the battlefield
If you do, its an outright removal spell for the measly extra cost of an extra 1/1 token on the board
If you want some powerhouses, you should pick up Avacyn, Angel of Hope, Archangel of Thune, and Battle Angels of Tyr
Humble Defector is the more popular version of this concept that I remember, drawing you two cards and then passing over to another opponent for them to use
Nizzahon ranks four burn spells as worse than Kamahl's Sledge