We all want Hel and other great heroes, but it all comes down to randomness in the end.
I encourage you to be moderate in your spending appropriate to your budget, and to consider reading these two posts that provide good insight into the gambling nature of hero summons:
- What exactly is a Gacha? (Read before posting things about "unfair pulls")
- How much should I spend?- HotM cost, and odds, analysis
Also, if you run across websites claiming to offer free or discounted gems, you should be cautious that those are typically scams, and that even if you were to find one that worked, SGG has a strict policy against it that will at minimum result in revoking your access to the heroes, and can result in permanent bans from the game. (See here, here, and here.)
I have no vested interest in this — I’m just a fellow player and volunteer moderator for the Forum. But I do care a lot about players being able to enjoy the game, so I’m sharing this just to avoid heartache from scams that are out there.
Hope it helps, and if you do decide to Summon, I hope luck and RNG are in your favor!