Sure, you could squeeze a little extra value out of a Genesis Wave, Torment of Hailfire or any other X spell, but doubling down on Hydras would be a fun way to go
Its only in the decade or so since Innistrad that spirits have become one of the premier tribal decks in tournaments: a Blue-White deck that flies over creatures and heavily disrupts enemy removal
Winter, Cynical Opportunist's attack trigger alone could drain up to 3 life from each opponent
So shes very useful in-game, though this cards value, currently at $225 , is far more likely due to its wonderful art
It is some tempo and some card advantage in the form of a tutor effect
Otherwise, its a vanilla four mana 4/4