"Dash [cost]" means "You may cast this card by paying [cost] rather than its mana cost," "If this spell's dash cost was paid, return the permanent this spell becomes to its owner's hand at the beginning of the next end step," and "As long as this permanent's dash cost was paid, it has haste." If you choose to pay the dash cost rather than the mana cost, you're still casting the spell
Sin's last ability puts all counters that were on Sin onto the target creature, not just its +1/+1 counters
And unlike most abilities that stipulate that the character cant quest after being readied, Eruption says nothing of the sword, making this a pretty strategically advantageous card
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There are two cards featuring her: Yuna, Hope of Spira which can be found in the Main set, and Yuna, Grand Summoner which can be found in the Commander Deck
Vivi is the ultimate spellslinger commander