Of the four, Zargala is likely the one that'll benefit you most. But you may want to post your full roster, there may be others that you are unaware the value of.

+1 for Zargala and make Katun speedy, put to leader slot and you easily reach with this team to gold league in arena

I'm not sure I'd pick any of those at the moment, though it depends on where you are up to with content.  I agree with krama that you should post your full roster, as there might be some other champions that are better options in the long term.

Is there a way to copy and paste my full roster?

Easiest way is to take a screenshot and then paste that. If you're playing from your phone, most phones have the ability to take screenshots by pressing some combination of the side buttons.

What do you play on?

On Windows PCs you can press Windows Key and G to bring up a menu where you can take screenshots. On Android phones it is usually pressing the volume down button and the power button at the same time, and that will take a screenshot.

I don't know how to do it on Apple stuff.

if you're on a mac, press command+shift+3 to screenshot the whole screen, or command+shift+4 and drag your cursor to highlight the desired area if you only want a portion. on an iphone, you'll need to press either the power and home buttons or power and volume up buttons simultaneously depending on the model.

I don't have much lol

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Bit of an interesting spot with Khatun, Zargala being reasonable options.

Personally, I'd be inclined to keep making food right now/farming gear. I'd also treat your Galek and second Saurus as chickens if you weren't planning on doing so. I'd like to turn that 2nd Saurus that's 50'd into food too. Were you planning on using him as a campaign farmer?

With Warmaiden at 50 I'm less interested in investing in another defense down champion at the moment (even a better overall champion), since Zargala's A3 is a 4 turn cooldown when booked. If this were a Dhukk, a Deacon, etc. it'd be a slam dunk 60.

HK on the other hand, getting access to a banner for her with 6* and ascension could be quite important for speed purposes.

I'd be curious to see what others have to say, so let's bring this thread back up to the top. :)

 Saurus was going to be a campaign farmer but is now food

Who is your farmer now?

Kael enough for farm, dont waste foods for Saurus, thats not easy gearing for good farmer in early game. Lvl up Zargala first, Katun not need to lift too, just make speedy. Your best choice is Zargala it is no question.

To Arena : Katun leader slot for speeds,Zargala,Kael and Deliana. This is a Gold Arena team, i reached with a 35 little account with worsen possibility aka (heroes) easily, with speed/def down/nuker strategy.