Hello marshmallow peeps! I am working on a Suicide Squad themed team. That said I'm not great at team building yet just started playing a few months ago. I have the following units..

DC75 Deadshot
BAO Deadshot
LOD Cheetah
LOD Black Manta
LOD Giganta
FFF Captain Cold
FFF Mirror Master
FFF Captain Boomerang
FFF Pied Piper
FL Captain Boomerang (Digger)
FL Captain Boomerang (Owen)
FL Amanda Waller
FL Fiddler
FL Pirate Deathstroke
FL Harley Quinn
FL Reverse Flash
JLTW Copperhead
JLTW Killer Frost

Any idea how to best use these on a 300 and 600 team comp?

Here is a 300 point team idea utilizing your figures:

Harley Quinn - 65
Copperhead - 73
Fiddler - 76
Mirror Master - 75
Black Light Ring - 8

294 Points

I immediately started building the team around Harley Quinn. She is just great for her points and offers a lot of versatility to your team with things like Outwit, Side Step, Poison and Probability Control and Perplex that helps out 'Her Puddin'. From here, I added Fiddler who I have had great success with due to his Defend and Probability Control. Keep him behind your other characters and boost up all of their defenses to 18. This is great for Harley Quinn in particular as the 18 defense with Defend combined with her Combat Reflexes gives her a 20 defense in close combat. Next, we throw in FF Mirror Master who can carry around your entire team with phasing. This helps you dictate the pace of the match as you can pretty much get your entire team into the heat of the battle all at once. Mirror Master also has Probability Control which gives you 3 characters with Prob, so you won't be missing many attacks. Last, we add in Copperhead. His Plasticity means that once Mirror Master carries him next to the opponent they will be having a tough time escaping the battle. This also helps Harley Quinn's poison be utilized to maximum effect.

Overall a fun little team. I might have to try it out myself!

How about at 600 points? I tried that 300 team out and it worked well!

added new figures still looking for a 600 point comp.