This is merely scratching the surface of this epic character
Wizards of the Coast senior narrative designer and TMNT narrative design lead Crystal Frasier began the preview explaining her role in designing this set, stating, "We're incredibly lucky with TMNT that a lot of our artists were already huge fans of the property, so a lot of them went above and beyond." As Magic: The Gathering fans already know, every card has just a hint of storytelling happening, even outside of the sometimes-included flavor text, and that hasn't changed with this set
Hraesvelgr's last ability resolves before the spell that caused it to trigger
Disney Lorcana Single-Player Decks include everything you need to start playing against another player
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as a flashback cost), add any cost increases (such as kicker costs), then apply any cost reductions (such as that of The Fire Crystal's first ability)