Its why I take Auriok Champion very high when I want a Soul Sister effect both it and this Cleric en-Vec have protection from red damage wraths, too, making them a little more survivable
And if you havent seen the Mega Diancie ex from Ascended Heroes yet, its worth looking up
Personally, I think HGSS, Triumphant, and Black/White are the most valuable packs
Based on my time with it so far, that could finally change with Disney Lorcana
For those that are a bit more limited in terms of budget, it will take extreme luck or quite a bit of time to grab the pricier cards
For as long as you control Kotose, you may play one of the exiled cards, and you may spend mana as though it were mana of any color to cast it