Few Aggro-Combo decks have ever been able to claim that, but we can still aim to approach that and to make very few sacrifices to incorporate a combo element. How Much Life? One deck I worked on back in the day that tended to get mislabeled a “combo” deck was Soul Sisters.
Aggro, meaning a quick, aggressive deck that aims to kill off the opponent. Control, meaning a deck that takes its time and aims to win in the long game. Combo, meaning a deck that puts together some combination of cards that secures the game near-instantly. But, of course, these are no ordinary, stock Modern decks.
While aggro decks win by executing their own game plan, control decks focus on shutting down the opponent, and win the game later, at their own convenience. We call them control decks because their goal is not to kill the opponent, but merely to control the game.
While midrange decks can circle the entire color pie, there are a few colors particularly conducive to the strategy and to which midrange decks have historically been drawn. "The Rock" was a black-green Extended deck originally popularized by Sol Malka, and one of the most iconic midrange decks in Magic.