As you probably know, before my game fell apart I was running a Ravenloft game and it just so happens that the most recent set of Magic cards: Innistrad, was becoming a rather large piece of inspiration for setting up my game, especially the monsters (see my Grave Titan)
Hybrid Mana, as a tool, has been underutilized for the past several years, in no small part because printing new Hybrids would essentially act as printing a bunch of gold cards for Commander
While Yuna doesn't give the card draw that makes these decks run so well, she offers enough other abilities to make her one to consider
Virtue of Strength $3.90 Virtue of Strength saw its value maintained while other cards, like The Irencrag, deflated in value
Marina Vendrells Grimoire Marina Vendrell's Grimoire provides a massive burst of card draw with the promise of more on the way if you gain some life, which isnt hard if you pair this with cards like Oloro, Ageless Ascetic and Cosmos Elixir
If other effects that set these characteristics to specific values start to apply after Jolrael's ability resolves, they will overwrite that part of the effect