Use of gems

Hey guys, just wanted to get some opinions on the best way to spend the gems earned from the battle rankings.

Since HP is the main currency in the game, it seems to make sense to go ahead and use the gems on that. However, it could also be helpful to save up for the card packs.

What do you guys suggest?

personally i would just get hp by trading away your rares. the only way to get really good cards for sure is thru gems. its 20/hp and 200 for a HR card pack. no non-treasure HR that i have heard of goes for 10hp. if i were you, id save it for card packs.

Save for card packs, once you rank higher and higher on battle rankings, you will be awarded more gems to achieve card packs quicker

Like everyone before has been saying, save it for card packs. I ranked in the 200s and I'm saving the 150gems that I now have for the 200 HR&UP Card pack.

and how to rank higher? just challenge random people?

You gain a varying number of holy points every battle, and significantly more if you win. You are ranked daily, but it adds up to a weekly ranking. To rank among the higher individuals it usually takes quite a few HP. Personally I can use about 15-30HP a day to maintain a 200-300 rank, and for those top 10 numbers I'd estimate about 100HP is being used.

does it worth to invest the hp?
i can imagine if you save the hp you could trade for powerful cards