TY all for help, as Elwin said its about trap but i found that ice snake spell is very good too.
Ive done that tournament (1/3 units got killed) and got dragons sword (nice stuff) - thats where I found that ice snake 3 is very good for slowing them down. Ice snake on unit near dragons seems to work.
Instead of inquisitors Ive put knights as reserve tank, and some heavy dmg in round 2 since i put my dragons near enough for them and opposing dragons are slowed, or maybe they are not (i dont see buff on them) but if i cast that spell they simply dont move as much.
I went to do red dragons q and killed them with no loses.
As for the banner, Ive checked literally every shop and I all can find is +100 leadership. Oh the randomness... Along the way I even found gladiator sword (10 might runes after 50 victories)and with its runes Ill be able to take tactics
Ill replace bowmans with skeleton archers to see how it goes.
Till then.