A short disclaimer before the below sentence in italic: As I wrote in the intro of the article, many Magic players have very stern ideas as to what constitutes a combo
4 Etali, Primal Conqueror // Etali, Primal Sickness Bringing back an Etali, Primal Conqueror early in the game is a guaranteed way to get a bunch of free spells when it enters the battlefield
The notable exception to this rule is the concept of a 16.5 land deck
Cori-Steel Cutter Monstrous Rage Stock Up Between Izzet Prowess, Izzet Proft, and Jund Midrange, a combined 43% of the field is using Cori-Steel Cutter
It makes sense that the biggest murder case that Magic: The Gathering has ever seen has some crossover with the classic whodunit board game Clue (or Cludo depending on where you live)
Then you can -7 as an ultimate to have your foe exile X cards from their library where X is your exiled mana cost, so that's a win-con over time