Talk:Lock You/Rulings/@comment-17735796-20150102161245/@comment-35019468-20150104200501

The purpose of this ARTS is to stop your opponent from using ARTS during your attack phase, or to stop them from spamming spells in one turn. Mostly the former.

The rulings and the card text do not contradict. If you use Lock You to cut-in on the opponent's spell, Lock You does not retroactively change the spell's cost. The cost of that spell was already paid, so the spell already went through. Lock You only increases the cost of spells cast later that turn, after Lock You was used.