I don't really play any non-competitive decks, but my favorite ones right now are Maly Handlock, Lightbomb Priest, Ramp Druid, and Oil Rogue.

My favorite deck to play is my old grinder mage. There is just something lulzy about playing piloted shredder and belcher like 5 times in one match.

Old miracle rogue

The question was which one is "fun"
Not your favorite.

There's no way anyone can find Ramp Druid more fun than other decks...

The one that is most fun for me is maly lock. Ramp druid is fun for me because I haven't played druid for awhile and it does better than my other main decks vs hunters

https://www.youtube.com/watch?v=SByxzBoTUMU

the video is quite old but its still working even after soulfire/leeroy nerfs

i use a similar one
-2 argent squires
+1 hellfire
+1 mukkla

mukkla is usually good on empty boards but sometimes its better not to play it so you can replace it with a worgen infiltrator or an argent squire

I think all rng cards that can swing between really good and really bad are fun. Like shredder is rng but aside from like doomsayer everything that comes out of it is pretty much the same.

But cards like sneeds, unstable portal, and webspinner are fun.

I love velen otk priest always when combo succeed.

mindgames (well, not that fun in aggro-heavy meta)

any slow deck,that can actually make several things,instead of crushing opponent face 24/7