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==OCG Rulings==
*Sending this card from the field to the Graveyard during your [[Main Phase]] is a [[cost]] to activate its the effectthat inflicts damage.<refname="No.3763">[http://yugioh.faq.konami.jp/EokpControl?&lang=en&tid=26717&event=FE0006 Konami OCG FAQ]: Spell Card > Wave-Motion Cannon</ref>
*The effect of "[[Lifeforce Harmonizer]]" can only be chained to the [[activation]] of a card when that card would inflict damage. You cannot activate it when "[[Wave-Motion Cannon]]" is first activated, since it is not inflicting damage. You cannot activate it when "[[Wave-Motion Cannon]]" is sent to the Graveyard, since you are not activating a card. The same applies to other Continuous Spell/Trap Cards that inflict damage.<ref>[http://yugioh.faq.konami.jp/EokpControl?&lang=en&tid=46642&event=FE0006 Konami FAQ]: Can the effect of "Lifeforce Harmonizer" be activated in chain to the effect of "Wave-Motion Cannon"?</ref>