What ? No choice for 5 color builds ? I started playing Magic during the Invasion block and the first deck I bought was Domain and I immediately fell in love with it. I like having to play a game (trying to get the 5 basic land types out) within a game. Harrow is the best spell ever. Collective Restraint is the first card I bought as singles (I always bought boosters for quite a while). Draco, Cromat, Child of Alara, etc. I just love domain.
As for the color I hate the most, it's blue. Especially mono-blue. If I'd be on a battle field dueling another wizard and he wouldn't cast anything other than counterspells, I'd simply stop casting and start wacking him with my staff asking him to counter that .
Black. I love the flavor. I love the creatures. I love that my counterspell is "I'm gonna Murder your creature." I love that sometimes I'm going to punch myself in the face.
I got back into Magic last fall, so just started learning the Guilds. Guilds of Ravnica didn't really appeal to me, but I was hyped for Ravnica Allegiance because Orzhov looked so much like what I wanted, and it did not disappoint.
I really like Blue. When it comes to EDH, I like 3 colour decks with Blue. So: Bant, Esper, Grixis, Jeskai, Sultai and Temur. I'm hoping for an interesting Jeskai or Temur Deck in the 2019 Commander set.