Can be any format.
For Commander decks, I have at least 5 Dragon tribal decks already and am planning to try to build a dragon tribal deck out of every possible multi-color combination plus mono-red eventually. But Slivers and Eldrazi are up there too as two of my favorite tribes to build around.
Cephalids! Don’t even know where it came from but at some point I got the idea to make a deck around Aboshan so I ended up going full cephalid tribal and while it’s not very good I love it anyway.
I really like playing Knights, the entirety of the lore in the game around them is really fun too. Other than that I think birds or 1/1 flyers tribal is fun, as well as defender tribal with Arcades as the commander.
I had a good life gain angels deck before the last rotation that i really enjoyed
My favorite tribal decks before I took my EDH decks apart were vampires and dragons. Vampires for the aesthetic + flavor and having enough to go deep on the tribal theme. Dragons because who doesn’t want to whirlwind slam a deck full of fatties?
I used to love Vampires in Ixalan Standard when Arena was new.
So I got a soft spot for those
Dinosaurs, probably. I have a Gishath deck in paper and on arena and they’re super fun.
I’m stuck on Demons. It’s challenging to keep the mana curve to a manageable level but otherwise finding it fun to play especially after the Warhammer 40k set added some additional choices.