The new Rooms spells are just another tweak on the familiar concept of split cards the biggest difference being that both halves are enchantments
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In Modern, CotV mainly sees play to have hate interaction against one drop creatures like DRC and Ragavan and 0 mana spells like Living End, Glimpse of Tomorrow or Crashing Footfalls
Some decks will be very happy with it, while others wont care too much
5 mana means you're transitioning from initial ramp to this to something huge or else it's too expensive, but luckily green has plenty of things that fit the bill
Calix, Guided by Fate Enchanting This version of Calix isnt a planeswalker, but they are still pretty good
