A challenge!
The complete Battleworld set is in front of you, no other clix elements, with multiples of generics but only 1 of everything else. What 300 pt team do you make?

My ideas:
240 Regent
30 Thorus
25 Alex Wilder
=295

175 Thanos prime
25 Thanos Duplicate
25 Alex Wilder
30 Tony Stark, Inventor
45 Witch Hunter Angela
=300

Mystical Theme
150 Witch Queen Le Fey
25 Alex Wilder
40 Nico Minoru
75 Iron Fist
=290

220 Destroyer Thor
25 Alex Wilder
25 Molly Hayes
30 Thorus
=300

Depends, can we use non-Battleworld maps? If so, I've seen this team work out darn nicely on the Wakanda map:

Force Build 9089601 0
Set	#	Name	Team	Pts	Value
SWB	025	Crystar		75	SELL
SWB	026	Moltar		75	SELL
SWB	056	Witch Queen Le Fay		150	SELL
Force Total:				300	$0.00

Weirdworld theme for map roll and Themed Team Probability Control. That plus double Leadership plus solid Mastermind fodder keeps Witch Queen running, while the sidekicks have their own decent damage output as well.

Also, are we playing only against other Battleworld-only teams? If that's the case, I might go for a Mystical theme like so:

Force Build 9089601 1
Set	#	Name	Team	Pts	Value
SWB	058	Thanos		200	SELL
SWB	045	Nico Minoru		40	SELL
SWB	042E	Jennifer Kale		33	SELL
SWB	031	Alex Wilder		25	SELL
Force Total:				298	$0.00

Suffers from the usual weaknesses of such a Tentpole-focused team, but hopefully the Stealth on the Runaways lets them shield Ms. Leafy Greens from sniping. Her Leadership off of Thanos can help him refrain from the Colossal Stamina damage that I've seen cripple several of this Thanos in Sealed.

Yes, any modern maps. And only vs other all-Battleworld teams.

That Thanos is a beast with so many likely Battleworld keywords around. I wish I had him I was trying to figure out a Regent theme - get behind lots of blocking and fire away. Maybe just use Scientist.

Hmm, good info. Sounds like a format that's gonna see a lot of SR Thanos, which brings me back to a WQLF rec. Her Weirdworld trait makes her a favorable matchup against him (as I'm sure you know).

How about a Mystical theme?

Force Build 9089679 0
Set	#	Name	Team	Pts	Value
SWB	056	Witch Queen Le Fay		150	SELL
SWB	045	Nico Minoru		40	SELL
SWB	031	Alex Wilder		25	SELL
SWB	042E	Jennifer Kale		33	SELL
SWB	063E	Sheriff Strange		50	SELL
Force Total:				298	$0.00

Barring that, I'd go back to your Regent idea, but I'd swap Thorus for Outrider. Outrider's ability to tie up and shut down opposing support powers have helped me out more than Thorus' back-dial Probability Control (which wouldn't trigger unless Regent himself is KO'd, and if that happens you've got bigger problems, right?)

3 maestro running wild ?

They seem cool with Perplexing

Now there's an idea. Wonder how that team would fare against a tentpole team centered on SR Thanos. With proper support, he's one-shotting a Maestro each turn... theoretically...

A team mate of mine went 4-0 with this at Team Worlds

maps were:
Civil War: Storyline Organized Play Stamford
Avengers/Defenders War Wakanda
Elseworlds High Noon Street

Force Build 9089957 0
Set	#	Name	Team	Pts	Value
SWB	058	Thanos		200	SELL
SWB	009	Thor		60	SELL
SWB	046	Chase Stein		35	SELL
Force Total:				295	$0.00

I'm not sure if this would hold up against a 6 or 7 piece themed swarm.

Also, Ed I pm'd you!

Speaking of swarmy...

Force Build 9089959 0
Set	#	Name	Team	Pts	Value
SWB	060	Gertrude Yorkes & Old Lace		30	SELL
SWB	015	Molly Hayes		25	SELL
SWB	015	Molly Hayes		25	SELL
SWB	031	Alex Wilder		25	SELL
SWB	032	Karolina Dean		55	SELL
FFSWB	004	Lucy in the Sky		60	SELL
SWB	045	Nico Minoru		40	SELL
SWB	046	Chase Stein		35	SELL
WKD	D17-V001ST	Terrain Dial		5	SELL
Force Total:				300	$0.00

terrain dial = Batman: The Animated Series Gotham City Waterfront (+5 POINTS) SHIPPING CRATES BONUS

Nah man if you're gonna swarm the Runaways you gotta go:

Force Build 9089980 0
Set	#	Name	Team	Pts	Value
SWB	015	Molly Hayes		25	SELL
SWB	015	Molly Hayes		25	SELL
SWB	015	Molly Hayes		25	SELL
SWB	031	Alex Wilder		25	SELL
SWB	045	Nico Minoru		40	SELL
SWB	046	Chase Stein		35	SELL
SWB	046	Chase Stein		35	SELL
SWB	060	Gertrude Yorkes & Old Lace		30	SELL
SWB	060	Gertrude Yorkes & Old Lace		30	SELL
SWB	060	Gertrude Yorkes & Old Lace		30	SELL
Force Total:				300	$0.00

A Gert for every Molly to keep the tokens coming off; two Chases for mobility, an Alex 'cause that piece is busted, and a Nico to fill the points. ;-D

I really like the Gert and Molly combo and Autonomous Old Lace with Flurry, B/C/F, 18 defense with combat reflexes, yikes! But, I'm not sold on Chase Stein as a taxi. He is only going to move 4 squares, if, he carries 3 or more friendlies. Then, he either has to rest or push. I like him more for the ability to grant improved targeting hindering. Karolina Dean would be my taxi, for the stealthy meat shield Molly Hayes. You could place Molly halfway across the map in turn 1, potentially, if you place her in front of Karolina after she carried her, with the possibility of a sidestep, afterwards, if she is within 4 of an opponent. Anytime you can lock down someone with Molly, and force them to deal with her bustedness, is advantage you, IMHO. Without a critical hit or some kind of buff to damage even SR Thanos can't one shot Molly, if he can even target her. Also, with the Battle World only stipulation, the Runaways, in general, are missing perplex aside from Alex, if your opponent even allows it. Another reason to play Lucy in the Sky with her pulse wave, at least her attack will be base against base stats. However, between TTPC, Nico and Alex you should be able to prob some hits into misses or vice versa. I can not deny, I do like that +10 to map, what map would you choose?

This may be a terrible idea, what about 3 dino thors and a alex wilder? Probably not meta but sure fun.

I came up with these.

Thanos 058 200
Sheriff Strange 063E 50
Nico Minoru 045 40
Or
Drop Sheriff Strange for
Alex Wilder and Jennifer Kale but since I figured out that move 1 then carry Thanos trick I like a flier.
Mystics theme basically just a Thanos tentpole team. Since Thanos decimates most of this set.

Iron Man 003 65
Sheriff Strange 063E 50
Nico Minoru 045 40
She Hulk 023B 130

A yo-yo team. I love TK and if the TKer has a super uber PC then it is bonus. Sheriff Strange has RCE and he and She Hulk can +2 perplex each other. She Hulk also has empower/enhance. She Hulk also gets around SC, MM, and Stealth.

Odin 066 175
Alex Wilder 031 25
Thor 009 60
Nico Minoru 045 40

I really like Odin the ability to outwit Thanos and Regent plus his free attack are huge. I am torn between playing him top dial or starting with outwit. Thor hits and pulls a token off Odin, also to taxi his pop. Nico again for PC and TK. Alex is there for support and to push to outwit if needed.

Namor 062 100
Iron Fist 064 75
Iron Fist 050 75
Molly Hayes 015 25
Alex Wilder 031 25

Namor carries all 4 of his teammates. Alex is support. Both Iron Fist are close combat monsters as is Molly. Namor provides leadership. Just swarm and hope defense holds up. It helps that both Fist have SS and female Fist prevents quite a few close combat options.

Those are a few teams I would play. I think that Kilmonger and Angela are very good and have teams with both as well but I like these best. If Regent and Thanos SR had Monster keyword I would definitely include Angela but she helps with Spider Island problems.