X-Men Energy is a lot of fun, and has a lot of possibilities. Lockheed and/or Jubilee make for a strong opening turn!

I run a build of this myself. Lot's of burn! The Energy Iceman on 6 is pretty sweet too!

1. Any villian build, yeah I am on the darkside Muhahahaha?
2. Any MK / MS type of build
3. X-Men Energy - this one is fun.
4. Probably the worst team ever - SinS, but fun as hell for me.

1. AGL
2. Minions, War Paint, etc.
3. Fate Squad
4. X-Faces (even post no-Dr.)

squad is really fun but i love sentinals

1. Glock (GL fan!!!...Too bad about Doc Light)
2. Future Beats (When it works...it's disgusting)
3. Gotham Knights (Bat Fan!!)
4. Shadow Pact (7-Drop Burn)[P.S. It should read: As an additional cost to play Shazam, you must say, "Speak my name Billy!"]
5. Crisis splash (What other deck let's unaffl. characters team attack?)

TT,HV,FateSquad,Check/Assasins,X-static,Kree,HOG/Inhumans.I LOVE this game. If I had to chose one it would be Check/Assasins so much fun.

1. Emperor Joker
2. Future Foes-Hand Depletion
3. Four Freedoms Plaza

1) Gamma Doom. I just love playing characters and saying 'Next turn.'
2) League of Assassins.
3) Mono Kang. Only one character in the entire deck.
4) FUNderbolts. This deck knocked my Crime Lords/Marvel Knights deck down to number five.
5) Crime Lords/Marvel Knights.

Anything Brotherhood (TNB or Lost City) and GK.

The latter of course loses all the time but Fizzle is always fun.

not really a constructed deck, but i always enjoyed drafting and playing the standalone xstatic theme in marvel knights.

For sheer fun factor:

1. Mono Doom
2. Big Fat Bat
3. Spidey-Swarm (the only deck I have that would be affected by the Dr. Light banning:-()
4. Goblight - it's a deck I put togethr abusing the 5-drop Green Goblin, the 6-drop MOR Dr. Light, using Mongal and Shimmer to basically go from 'combat phase' to 'kill your opponents without the need for combat' phase. It's definitely more for fun than for competitive play.
5. Anti-Matter/Negative Zone

Pier Pressure and variants thereof (though I still use ARB, so it's not tourney legal)
Morlock Evasion (Huzzah for Marrow!)
Inhumans/Anti-Matter (Fully-Fated Johnny Quick + Thunderous Onslaught + Matter Convergence is just plain fun)
Red Robot Revenge (Manhunter burn)

I'd be interested to hear what JonnyMono's running in his Galvanizer deck.

Current Faves:

Kree
X-Statix stall (Galactus-9 and Identity Crisis)
Infinity Gauntlet (total Jank, but O-so Fun!)
Gotham Knights/X-Men stall (Longshot, Harvey Bullock, cops, Power Nexus and Starro! - not a tier 1 deck, but great fun when it gets it's weapons out!)

Currently working on a LoSH/Darkseid deck - Love that Legion!

Fun decks:
Mono Secret Society featuring the other Poison Ivy (yes, the 4 drop!)
Big Bat
Wild Vomit
JLI-IG Insecticoid Troopers Team Attack
IG-Doom. Sooo funny to give them everything they want out of their deck and they can't use it.

Mono Shadowpact

No Hand Squad

A JSA/Shadowpact deck that's more theme than anything.

Doomed Earth (my variation) is quickly becoming a favorite