I played Magic all the time in High School and i still do to this day. It's just something me and my friends enjoy doing. My friends Dad used to own a shop and I would spend most every day after school at his shop playing with friends and looking at cards. There would be weekly tournaments that I would join in. I never won or even placed but I had a great time doing it and hanging out with friends.
I currently have 2 binders 100% full and i need to get a 3rd one soon because I'm running out of room for my loose cards. I know I have over 1,000 cards but i don't care to count to find out the exact number.
I have 6 decks I use regularly depending on what I think my opponent might use or what i feel like using.
Beast Deck (Green)
Flying Deck (Blue & White)
Knight Deck (Green & White)
Vampire, Goblin & Human Deck (Black & Red)
Dragon Deck (Red)
Burn Deck (Red)
Only 2 of those are Premade decks (Knight & Dragon). What I like to do is buy a few Fat Packs and then go through card by card and see what i have and what I think would work well together. If it turns out i was wrong I either dismantle it or tweek it until it does work. The cards I don't make into a deck I put in a binder separated by color with each color separated into Creatures, Instants, Sorcerys, Artifacts & Land. Some would say I'm crazy but I enjoy just going through my cards and separating them to put them in the binder.