The big problem with that is that you're talking about needing as many cards to play that turn as with the Bamf! plan, and you may well need to play Glass Jaw in multiples to handle a larger field, whereas Bamf! only needs to work once. As a plus, if you go MK/F4/JLA instead of a standard team-up with the X-Men, the addition of Quentin Carnival can add a little extra tech for you; it can remove an Nth Metal without the need for Stretch to pay more END.

I agree with c-rock, the glass jaw is unlikely that's why i say bat's belfry because it triggers on every attack. and harley quinn obviously has a natural synergy with ally abilities I'm working on a list and i'll try to post it soon

AI... interesting. The Belfry is an interesting choice. Makes sense, though.

Another possible idea is to team up with the Avengers, since Barry + Quicksilver + Legendary Battles accomplishes a similar goal.

Is it just me or is he unplayable in straight JLA?

Characters:
4 DOR-067 Harley Quinn ~ Dr. Harleen Quinzel
1 DJL-007 Elongated Man ~ Ralph Dibny
4 DJL-005 Connor Hawke <> Green Arrow ~ Son of the Archer
1 DJL-001 Aquaman ~ Arthur Curry
4 DOR-065 Charaxes ~ Drury Walker
4 DJL-014 Katar Hol <> Hawkman ~ Thanagarian Enforcer
1 DOR-074 Poison Ivy ~ Pamela Isley
4 DJL-135 Scarecrow ~ Fearmonger
1 DJL-016 Oliver Queen <> Green Arrow ~ Hard-Traveling Hero
3 DJL-003 Barry Allen <> The Flash ~ Scarlet Speedster
2 DGL-166 Two-Face ~ Split Personality
Plot Twists:
4 DOR-089 Fear and Confusion
4 MSM-161 Sucker Punch
4 DJL-032 Reform the League
4 DOR-090 Kidnapping
3 DSM-142 Smiles, Everyone!
4 DGL-201 Millennium
4 DJL-029 Hero's Welcome
1 DJL-217 Justice League of Arkham ~ Team-Up
Locations:
3 DGL-167 Bat's Belfry

60 Total Cards

I was starting to think that, but there's a way to do it, albeit not as abusively...

Dinah (4), Steel (5), and Barry. That'll get you a Smoke Screen for ensuring Barry's unstunnable one attack if you can't play a Sucker Punch and use Dinah to handle affairs. Stretch is just so naughty with Barry, but he's not strictly necessary, if you plan for it.

^^^ Too much work though.

I like the AI build. Mostly because I never thought Harley Quinn would be urging Flash to attack some more. :) Now that's a funny comic to see.

And hey, it gives you a very solid curve.