"whatever your strategy is, you must figure out what you want to do and why you want to do it. It will be mind-blowing to know this, but consider the fact in every tournament, you will play more games against sideboarded hate cards than against an un-sideboarded deck. In a way, your game 2 and 3 strategy must be equally as good or better than your game 1 strategy. You must decide: Do I go all in on turn one? Do I mulligan to a safer opener? What do I name with Cabal Therapy? What is my role in this game?"
"In similar deck vs. similar deck matchups, there are a couple of things that you want to look at to figure out what role to play:
1. Who has more damage? Usually he has to be the beatdown deck.
2. Who has more removal? Usually he has to be the control deck.
3. Who has more permission and card drawing? Almost always he has to be the control deck.
If you are the beatdown deck, you have to kill your opponent faster than he can kill you. If you are the control deck, you have to weather the early beatdown and get into a position where you can gain card advantage."
"I drag on in this section because it is the most important part of considering whether to play with this deck. You must know Legacy concisely, as well as your metagame, the popular sideboard cards at that given time, and what your card selections do or do not do well against them. There is no secret to the fact that this deck is one of the more easily hated against; your job is to make that hate ineffective, or meager, or just irrelevant. Thus, you must learn before you earn (stupid proverb)."
Excerpts from:
RThomas' Dredge Primer (Dredge or Die), 2017
https://www.mtgthesource.com/forums/showthread.php?31901-Primer-Dredge
Mike Flores' Who's The Beatdown?, 1999
https://articles.starcitygames.com/articles/whos-the-beatdown/
