Although Yuffie enters attacking when its ninjutsu ability resolves, it was never declared as an attacking creature (for purposes of abilities that trigger whenever a creature attacks, for example)
You're going to be running enchantment creatures, and Yuna gives enchantress decks a bit more of an aggressive playstyle by giving them lifelink
Here are some of the rarest Lorcana cards and their accompanying market price: [11] Belle - Accomplished Mystic (Enchanted) - $150 Hades - Infernal Schemer (Enchanted) - $250 Dumbo - Ninth Wonder of the Universe (Enchanted) - $255 Ariel - Ethereal Voice (Iconic) - $419 Minnie Mouse - Sweetheart Princess (Iconic) - $811 Mickey Mouse - Brave Little Prince (Iconic) - $1,459 Want to save this article
The front side isn't bad, and it coudl do some serious damage to token decks that aren't buffing their creatures with counters or anthems
If an effect would prevent the next time a red or white source would deal damage, it wouldn't prevent Bahamut's damage, despite him being both red and white, since his damage's source is colorless
Use Friends from the Other Side when your hand is empty and preferably while your opponent is holding key cards in their hand