Legacy Jund deck
Jund decks for the Legacy format tend to use a midrange strategy based on the "goodstuff" deckbuilding technique making use of Jund's high individual card quality. Using the best cards available in red, green and black, they win with the steady stream of solid threats and strong removal.
Overview
This strategy is to win the match via card quality. By playing the best possible cards in their colors, the deck intends to steadily gain ground and overpower the opponent.
It plays a bunch of situational cards to find its way to victory amidst adversity. Jund tends to have the advantage in a late-game top deck battle due to the high quality of the average card compared to an average random card from the opposing deck.
In theory, it is capable of facing any opposing deck. This generally makes the community refer to Jund as not having a particularly great matchup, but also as not having a particularly bad matchup.
This makes it a deck somewhat hard to pilot since many games will often depend on the player's knowledge of the game, the meta, their deck, the opponent's deck as well as the player's experience, level of skill, and play-style.