You don't have to spend $$$ to be able to consistently get 100 crystal every week. I'm not saying I'm pro, just based on my experience. There's plenty of 3* or even 2* mobs that can get you at the 1400 above ranking. All you need to know is their skill and imagine how the combo would be like. Search youtube for further understanding, there's plenty. Build on what you have, mobs and rune inclusive, no need to rush. Meanwhile just grind for better runes or leveling fodder. The actual trick in this game is 6* and rune. If you have max 6* even with decent rune, even with based 2* mob, you can go pretty far as well.



See? 3 mobs are 2* based. Yes Ramagos is a must have for beginner.

DON'T SPAM Mystical Scroll or even Unknown Scroll! Just don't... you can summon MS once a day or when you feel like it.
The myth :
1) 8-10 consecutive 1* from Unknown, then 1 MS (High chance to get 4* up)
2) 3-4 consecutive 2* from Unknown, then 1 MS (High chance to get 4* up)
I won't say this is a proven way, but I did try, and DID got 2 x 4* out of 5 times. Well, no harm trying right? In this way you will have plenty MS available, and countless Unknown...

Crystal summon Better Than MS. I say this is pure luck. I prefer to use the crystal for buying 2exp either 1 day or 2 days, then replenish your energy with crystal. I can get one 6* per day, if 3 days of 2exp, you just do the math.
Having like 500-600 crystal ready before you do 2xp.

If you are not aware, when monster evolve to 6*, their based stats pump up very very high. A 6* lvl25 mob is better than lvl35 5* mob. Just record the stats when you do your next 6*, you will get what I mean.

For Arena Speed is the very important. Yeah, you might have difficulty to pump 4 mobs to high speed, that's why buffer like Megan, Bernard, Water BH comes in. Speed leader? Water and Wind Inu got speed buff.
You will NOT have plenty successful defense, even with 5* natural mob. WHY? Cause the stupid AI doesn't know how to combo. But just concentrate on how to win, hence, speed buff, nuke!