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Each magecraft ability has a different effect, although they all have the same trigger condition, whenever you cast or copy an instant or sorcery spell.

For example, if you control Archmage Emeritus and cast an instant or sorcery spell, Archmage Emeritus's magecraft ability will trigger and you will draw a card.

If an effect creates a copy of an instant or sorcery spell, this will also cause the magecraft ability to trigger.

If an effect creates multiple copies of an instant or sorcery spell, magecraft abilities trigger once for each copy created by the effect.

Some effects instruct you to copy an instant or sorcery card in a zone other than the stack. These copies do not cause magecraft abilities to trigger. However, most effects that do this also allow you to cast the copy, and casting the copy will cause magecraft abilities to trigger.

Elemental Expressionist has received an update to its Oracle text. Specifically, the second ability granted to the target creature doesn't care that the creature's controller is the one exiling it. If the creature is put into exile for any reason, that ability will trigger.

If the magecraft ability triggers and resolves more than once with the same creature as the target, that creature will have multiple instances of each of the two triggered abilities the magecraft ability grants it. Each instance of the second ability will trigger separately, and you'll create an Elemental token for each of them. (Multiple instances of the first granted ability are redundant.)

If you target a creature token with Elemental Expressionist's ability, and that token would leave the battlefield, it is still exiled (very briefly) before it ceases to exist, and you will still create an Elemental token.