How to recognize an activated ability for Havengul Lich, Necrotic Ooze or Phyrexian Revoker

A common question that seems to pop up is how to tell the difference between Activated, Triggered and Static abilities. More specifically, what abilities will gain from dead creatures, what exactly can stop, and what abilities does get after you use him to do some necromancy. There's an easy way to recognize different kinds of abilities just by reading the card itself, because the abilities are always formatted a specific way. All triggered abilities begin with the word "When", "Whenever"

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