For stack interaction, Imp's MischiefImp's Mischief is really great in mono-black, and it just got a reprint in Commander Masters
Both BG Elves and WB Clerics love drain and gain effects already, so this slots right in perfectly
Niv-Mizzet, the Firemind was the first version and was one of the most popular and powerful commanders during the early days of the Commander format
Led byZinnia, Valleys Voice, this Jeskai (Blue-Red-White) deck is perfect for multiplayer battles and offers endless replayability
Consider this the first chapter of a dedicated series on the subject
This deck worst best when it has momentum, so if the opponent is able to control your board early, you may have a difficult time catching back up