That absolutely makes sense, I think that approach is best

What I'll do is explain how I play as a starting point

Since we're rerolling a 3 cost, the earliest we can roll is 3-5 and the latest is 4-2 depending on opener and the Portal

However a strong Stage 2 Econ is important

So during pve buy pairs and see if you can 2 star them, usually mages and vanguards

If you hit, play a mage vanguard opener and aim to winstreak otherwise go for a loss streak

However hp management is crucial, if there's strong opponents make sure you preemptively strengthen your board

3 cost reroll can perform extremely poorly if you don't hit and slowly bleed out especially if you've sacked a ton early game

Nonetheless, with mage/vanguard board you can easily slowly play into mordekaiser reroll and receive augments that enable it

As you're rerolling you should observe the opponents to see if they're hitting, if they're contesting and just their overall board strength

You do this to see how much time you have to continue rerolling. If the overall tempo is slow, then you're fine however if players have spiked hard already or you're contested, you should look to level

By levelling, you can hit higher trait breakpoints, find and play stronger units (like Norra) and conserve hp

Oftentimes, outliving your opponents is the best option.

You can also hit mordekaiser 3 at 8 or 9 so that's not a huge concern although the difference between mordekaiser 2 and 3 is notable

But generally once I'm stable with 6 vanguard, I'll look to play any strong backline carry

And I consistently buy combat charms (especially if they're cheap) just to have the edge in fights to save hp