I see too many flaws on this build, u are just changing heal for healing wind what for me have no sense at all, u need absolutely heal for 1v1, priests heal a lot less than the ability and may be they are healing creeps when u need it, with this build u cant stand a burst damage combat at all, u are going to run all the time and UB for example is going to rape u hard.
Healing wind is a pasive heal that have not effect at all in combat so why instead of heal?
U can do the same build with heal instead of healing wind and u are going to improve it a lot and u are going to do the same DPS with double of healing than now.
So what do u do when u are critical? wait and hope that the monks will heal u? too much risk for nothing, oh well, for healing wind
You underestimate healing wind. First of all, priests heal as much as or more than heal, depending on your hp. 24 hp/s is a huge amount of regeneration. As already pointed out, heal 1 would be 85 hp/s over time. The 24 hp/s is completely free and affects every allied demigod/unit around you. The boost healing wind 2 gives to priests lets them heal between 15% (monks) and 30% (high priests) of total hp. For 3500 hp this would be 525 hp or 1050 hp every 10 seconds. On someone health stacked it goes upwards of 1500 per heal and don't forget that while you can recieve one heal every 10 seconds from this, priests cast their heals on allied demigods and you have two of them.
I'm not saying you get healing wind 2 instead of heal, just that you should get both. Healing wind and priests gives huge raw healing to your team for free and heal gives large targettable burst healing. A great combo is heal 1 and healing wind 2 with monks early on, then as you get more mana you increase it to rank 3 for the 1200+debuff removal and buy high priests when you can.
And why are u stacking heal/armour with a healer? u just need mana and some armour/heal but not a stacked heal/armour and some mana, this is for DGs that cant heal themselves and need a large pool of HP to stand on the fight.
Getting the balance right is important. As it happens, hp stacking is very powerful for a number of reasons. People can get the (large) benefit from hp and still have no mana problems with the right play. Also, sedna is not so much a healer as support. With pounce and heal she works, but to reach her maximum potential she needs people with her, and reaching that potential does not consist of spamming heal. Pounce for the focus fire burst, silence too, healing is to keep people up while everyone does their job, which includes sedna. This is why she benefits from lots of hp.
U stack HP/armour because u cant be dependant of healing as a healer becouse u base it in priest that may heal or may be not... rolf.
Basic game mechanics: learn them before criticising. Priests will heal demigods whenever they can. A demigod can be healed by one type of priest every 10 seconds(the last time I timed it, anyway). The priest's cooldown is 6 seconds. It's not random at all and if you actually know what's going on you know exactly when a priest will heal you.
U can be lvl 20 with 4k or 5k of hp with an armour of 30% and a almost infinite pool of mana and u are going to pounce and heal nonstop but if u cant outheal the dps is a matter of time to die or run and u havent a good burst DPS as sedna, u must stand, outheal and pounce to win a combat.
(Pounce is awesome burst) But yes, you need to outheal and outdamage. In order to outheal you need both heal and healing wind 2 with priests.
The only thing I'd say about OP's build is I think the extra points in inner grace would be more useful elsewhere. Generally, I'd prioritise heal 3 over inner grace 3. Also, that point in pounce 4 is pretty open as you said. Inner grace 1 early is great so you can benefit from 10 hp/s and 5% speed for the edge, but after that you take it for the speed and you get speed as you need it. Usually with a wand of speed you don't need much more. Sometimes you're against a speed stacker though.