Theres tasks about the beast … example 10 task of king mukia and king krash who you deal 450 damage with beasts …
And Rexxar is 12 task : Deal 90 with your beasts … its a kind of troll that? Not 450 at least ? Its like one two strikes … 
and task ends
Be glad , if you scroll the forums you’ll see Cookie has a quest to kill like 900 beasts.
I complained for something that was so easy … not hard …i heard about 180 beasts … but 900 maybe its Task 19 who theres no need to do this …
Pt:Btw Another Troll task
Ragnaros 10 task
Deal 15 Combo Damage …
One turn and its over… Completed