Lithoform Engine

Activated abilities contain a colon. They're generally written “[Cost]: [Effect].” Some keyword abilities (such as equip) are activated abilities and will have a colon in their reminder text.

Triggered abilities use the word “when,” “whenever,” or “at.” They're often written as “[Trigger condition], [effect].” Some keywords (such as prowess) are triggered abilities and will use “when,” “whenever,” or “at” in their reminder text.

If an ability is linked to a second ability, copies of that first ability are also linked to that second ability. If the second ability refers to “the exiled card,” it refers to all cards exiled by the first ability and the copy. For example, if Fiend Hunter's enters-the-battlefield ability is copied and two creatures are exiled, they both return when Fiend Hunter leaves the battlefield.

The copy is created on the stack, so it's not “cast” or “activated.” Creating the copy won't cause abilities that trigger when a player casts a spell or activates an ability to trigger. Abilities that say that a triggered ability triggers additional times won't apply to copying a triggered ability.

The copy will have the same targets as the spell or ability it's copying unless you choose new ones. You may change any number of the targets, including all of them or none of them. If, for one of the targets, you can't choose a new legal target, then it remains unchanged (even if the current target is illegal).

Any choices made when the spell or ability resolves won't have been made yet when it's copied. Any such choices will be made separately when the copy resolves. Most notably, if a triggered ability asks you to pay a cost (such as that of Leyline Tyrant), you pay that cost for the copy if you wish to have it paid.