pvp is about speed and hard hits.
make athel and kael as fast as you can on their own, put spirithost (even lv40) as leader - go first or right after skullcrusher to provide atk buff - can die after that, if you feel like your champions could survive single volley add skullcrusher (to go first and put mass retaliate on all - can die afterwards).
from your rooster: spirithost as clear leader for speed + atk buff, athel and kael as AoE nukers. train apothecary as another + speed nad you are good to go.
speed + atk on AoE characters,
speed buffs,
leader with speed aura,
mass atk bufer or mass def down debuffer to go just before AoE
you go first and wipe the field before other team can even move...
playout order:
1/2. apo does speed buff, spirithost does mass atk buff
3/4. kael and athel do their AoE
5. look at win screen
there is no need for def if there is no one left standing after you unleash your AoE...