if u need her leader skill, then she worth it.
her skill just soso. from my point of view, she buid for 1 VS 1. not aoe types.
erm............ ur suggestion sound logic also. hehehe 
let me try play few more day with stunt.
if not satisfied with stunt rate, i try change other method same like ur suggestion. 
yup. 1 person 1  1
acty if u rajin arena ( not need top 2000, no need point 1400++) u can cincai cincai collect glory point 200 300 400 per week, and purchase an 1 devilmon per week.
this is what i weekly do. 1 week = 1 devilmon, 1 mystical scroll.

hello people! 22-day-old summoners war player here . just sharing a story

earlier, i just got ripped apart by a seemingly easy team in arena.
1. Opponent had 14xx rank points. using all water element monster.
2. the 4 monsters were hellhoundx2(5*), inugami(6*Lv.35), and witch(5*). all awakened.

So I thought they were sui yu, brought my wind lich, ramagos, rina, and fourth one i kinda cant remember which as i really thought it's gonna be easy, i think the 4th in my team was fire inugami thinking it is a good damage dealer even against water element.

Arena starts! omg They started first!? wtf? and my inugami died in first turn >.>. on my turn I cant do anything.. crit for 900+ damage? wow, does wolf have that high a def?
2nd turn, rina died without ever seeing her shield up.. well all dead in 4 turns without me even denting a mob (oh ya my wind lich with 700+def just got ko-ed with shield by inugami's teamup+multi atk (and i thought i can slowly grind down them water mobs with it lol)

morale of story, next time I won't look down on natural 2/3 stars mob haha

 

  can repeat like no tomorrow. aoe also,
if luck ong can stunt 1 or 2 mobs at the same times.

but 4 slot.
1 slot i plan for healer. currently taken by light bearman.

balance 3 slot i plan use all wind mobs, to maximize the leader skill from wind ninja.

but if people attack me with rina + 3 fire mobs, i koyak habis.    huhuhu

i now becomes farmer at faimon normal mode
incomes = bunch of useless runes, 3* inugami 1 ekor, 2* hellhound 2 ekor.
light garuda not my fav mobs. haha

kns... now farming Hall of Wind.. rushing before end time. Wanna vomit already... drop rate of high essence so darn low!!!!

Hi guy, wanna clarify one thing.
For example,
My leader skill increase 30% cri rate, att, res or else...
if in the battle, leader die liao, the 30% effect still have or no more?

the leader skill still is there. even leader die liao
u can check on setting (located left down conner at the screen) > ally buff.

acty arena matching still fcuking up. 

but people using "speedy" is not related to arena mismatch, this is one of they fighting ways. we cannot say the player r wrong.
same situation, some player using "tank" styles, some "aoe" styles, some "heal & support" styles. 
we cannot complaint on their playing styles. right? after all that is their freedom to use what mobs they think suitable.

I use speed + kaboom style 

Speed + Mass Stunner

Should I feed my wind Rakshasa to my fire ?