Play for Free Question

I am playing for free and I have 1925 HP currently saved up and I’m in a transition from going 2*>3*. Currently my roster is the following and my question is when/should I buy a cover for the 3*'s every time I have enough? Also if anyone has any advice on my character builds then I am open ears. Currently I am working on leveling up IM40 to 77.

Ares - Maxed (4/4/5)
OBW - Maxed (3/5/5)
Wolverine - Maxed (5/5/3)
Iron Man 40 - 72 (0/4/3)
MMN - 60 (3/5/5)
CStorm - 60 (4/5/4)
Thor - 60 (3/5/5)
Cap Merica 2* - 50 (3/5/5)
Hulk - 41 (2/2/1)
Punisher - 41 (1/0/3)
BP - 38 (0/2/2)
Dr Doom - 38 (3/0)
Spider-Man - 38 (0/3/0)
Invis Woman - 34 (1/1/0)
Hawkeye - 30 (5/5/3)
Moonstone - 30 (5/5/3)
Wolverine 4* - 30 (0/0/1)
Cap Merica 3* - 25 (2/0/0)
MStorm - 23 (5/5/3)
Daken - 21 (5/2)
Human Torch - 18 (1/1/0)
Psylocke - 18 (1/1/0)
Wolverine 3* - 18 (0/1/1)
DD - 15 (0/0/1)
CMag - 15 (0/1/0)
Sentry - 15 (1/0/0)
Thor 3* - 15 (0/1/0)

Using your hp for roster slots and for shielding after your final push in PVP will get you further than buying covers - much cheaper to use a shield and secure yourself a 3* from placing then to buy one. The best time to buy covers would be if you have a 3* you like with 10-12 covers to finish them off, but even that is questionable for a free player.

I suggest passing on IM40. Not very useful. Save your ISO.

Depends on the cover too, I’d definitely consider buying a yellow LazyThor if I was sitting on four of them already.