I watch a bunch of them (mostly lore, news/discussion and gameplay)
Rhystic Studies
Spice8Rack
MTGRemy
Desolator Magic
The Magic Historian
Tolarian Community College
Pleasant Kenobi
Alpha Investment (insider info vids, try to avoid the rest. Also taco's)
Reid Duke
Jim Davis
I also used to watch some Command Zone but there is only so much shilling and them trying to sell cards they just bought a stack of I can stomach
When i build a deck i just go were up to date decks are, maybe read some decks techs. Youtube vids never have up to date decks anyway so i don't see why you would look there. The only youtube vids about decks i ever looked at was
Legacy's Allure. He used to do talks about Legacy deck with good players.
OP: i don't know your opinions on youtube, but then again I'm not in the forums much. What is your problem with it?