"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
Each Play Booster contains: 14 Magic: The Gathering cards
However, with limited numbers of essential cards like 004-018-mirabel-madrigal-gift-of-the-family and 004-013-julieta-madrigal-excellent-cook, the deck really isnt a strong choice in terms of overall power
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
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