Quoting Orcun_BL,
reply 4
This really depends on which map and under what conditions. Oak and sedna while is quite strong in 2w2 cataract. They won't be as good in 2w2 prison. They are also less affective compared to Ub or rook due to lack of aoe. So in my ideal team of 3w3, oak and sedna wouldn't work. They are very strong late game, and pretty much impossible to kill, but they never have the lane control erebus, ub with monk support and rook with monk support does.
Counterhealing can remove the monk advantage, though, and Healing Wind 2 means Sedna's bishops are amazing. I've seen games turn around instantaneously at level 8 because of counterhealing. Add this with the fact that Oak and Sedna can both have priests, and you get something that cannot be killed. Heck, I've had games where Oak and Sedna can 2v3 and beat the other team off.
Maybe I'll write up my Sedna guide here.
Counter Healing is garbage against good people. It has a huge delay until it takes effect on the enemy monks. All you have to do is pop your monk back out of the aoe for 1 sec, run back, it pops heal then gets silenced again. (Which doesnt matter because it already used it's heal cooldown.)
