No they are not. You gonna need them for 1v1 dual battle.
And in late game with plenty of mana, minion-related stacking items and passive abilities, they are not that bad.
But, again general idols are much better than yeties; you need get them first, then get yeties in very last order.
why would you ever use sedna for minion build? It takes 14 skill points to almost max out Yetis, magnificient presence, and morale...
so you have no heal, no wind, no pounce.....awesome.
Erebus is a MUCH better minion master than Sedna...he gets idols, and the idols turn into nightwalkers, and then before they die, he gets Horn Of Battle, and then he Mists forms again to keep them alive....
Sedna just meows and jiggles her snowy boobs....oh...and yetis too....
you also spelled "dual" wrong....