Should I Sell Selenia Sky???

Should I Sell Or Hold Her?

I've been using Selenia Sky a fair bit recently with the green team and I was wondering whether or not I should sell her? Does anyone have any advice here? I was thinking the new reward cards may be op when facing Selenia making her value go down, although the low mana cost for dragons is always nice even without summoner buffs.

The reason I am undecided is that Selenia actually might become more op because using her with the blue team and that new reward card actually looks pretty darn good to me. The blues also have a few decent ranged monsters anyway, so buffing them while debuffing the enemy might be a good combo....

Please let me know in the comments what you think and what you would do if you were in my position.

Thanks,
Gringo