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Need some suggestions for July 4th deals

I'm having 12k units right now I'm in two minds whether to spend or not if i need to buy any which bundle is good or should I just leave it and save the units for something else

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For Tier 2 if you have 7 star rank 2 and planning to take to rank 3 go with bundle A.
For tier 3, i think its up to you. Considering you have 12k units if you go on all 3 tiers you will be almost empty of units so it would be good if you save it for later. But in my opinion, atleast getting tier 1 offer of 4 to 5 doesn't hurt at all.
If you can't get to valiant with your units den skip
Tier 1 = C
Tier 2=A
Tier 3=A
And ...
Confirmed
Thronebreaker=Paragon
2 weeks of daily play yields: 28 revives (14 from the daily super event, 14 from the Apothecary), 28 health potions, and then also the free crystals that will yield health potions.
You can get in about another 2 weeks worth before things expire. So essentially you should have 55 revives to play with as well as health potions. That should at least be enough to complete one path of most Endgame type content.
This way, you save your units for big holiday events to strengthen your roster, and utilize the free potions from regular play to complete Endgame content (to also strengthen your roster).
Granted, some of this depends on whether your roster is lucky enough to have the champions that will make endgame content easier.
In terms of this 4th of July, I would recommend getting the 750 unit offer regardless of what you decide to do, since that amount of units shouldn't matter in terms of completing content or saving for the next holiday.