Wait... Here's how to fix Ythan.

[Secruoser]

On top of ambush and 2x attack, give his ability to deal unreduceable damage regardless of armor/ability/stealth/protector. Situational but at least better.

[BP Holy Punisher]

It sounds interesting, but I would go with the +1 attack too. Since he is more of a comeback hero, you can't expect to regain the board with Kris/FFM early with only one attack and Bobcat/Viska after T6 with 3 attack. Almost no ally can be killed with 3 dmg, even 4 dmg is not that great now that more high health allies are present. So either increase haste ally options specialised for Ythan or give him more options for early board control.

[Magiczaba]

Old ability with a 3 se cost doesn't seem op to me.
I also agree that he needs more allies with haste.

[21Bananas]

While I agree Ythan's lacking, he does have some power.
Tama15. Search that guy's games. He somehow cobbled together a well-working Ythan deck, both twilight and non-twilight.
It's like a macabre clockwork - it looks real ugly, but it works well on practice.
Oh, and ignore his most recent matches. He rarely plays seriously and often does stupid things.

[BDK16]

I would be really interested to see how Ythan would be with the +1 attack. I think it might be a little too strong since he can attack twice, it's kind of a +2.