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During your End Phase, if a Fusion Monster you control is returned to your Extra Deck, you can Special Summon 1 Elemental HERO Neos from your Deck

1 Sprite Dragon

With the addition of one-mana instant-speed removal spells to the format recently, good one-drops are necessary for aggressive decks to survive, and red received a couple with Amonkhet

While that shouldn't necessarily come as a surprise given the number of recent sets that have featured upward power-scaling, Duskmourn 's most powerful cards also have the benefit of looking like they'll be pretty fun to play with rather than oppressive right out of the gate