User blog comment:Aquamirror/Some questions about legal moves in WIXOSS../@comment-113.210.192.120-20180428033326

From what i can confirm

Regarding spell usage, you may pay the cost of the spell and in the case there is no target for the effect the spell resolves and is sent to trash. For searcher types it can be considered looking through your deck as an effect and taking a card from there as 2 separate effs therefore not needing to take a card to resolve the effect as in wixoss actions are not compulsory unless stated or linked to another effect such as what you said in the post, with the ‘if you do’ text or like the new lv1 lrigs gain 1 coin and then drop 1.

Regarding arts is similar to spells in terms of resolution and yes, there is nothing that states that you cannot activate defensive arts on your attack step to have the arts in trash.