Both players must Set Spell Cards before activating them, and cannot activate them until their next turn after Setting them.
Rulings
Individual Card FAQs
The "use" in this card's text means "activate". So you may discard Spell Cards from your hand for the cost of other cards.
Netrep Rulings
If “Anti-Spell Fragrance” is activated in a chain to a Spell Card, that Spell Card will resolve properly. “Anti-Spell Fragrance” only applies to the activation of Spell Cards after the chain it is activated in resolves.
Field Spell Cards must be Set for one turn if “Anti-Spell Fragrance” is active.
Spell Cards that were Set for one turn before “Anti-Spell Fragrance” was active may be activated.
Trap|
Continuous