Prismari Apprentice — ruling 1

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.

Prismari Apprentice — ruling 2

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.

Prismari Apprentice — ruling 3

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

Prismari Apprentice — ruling 4

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

Prismari Apprentice — ruling 5

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.

Prismari Apprentice : règles, fonctionnement et interactions (MTG)

Prismari Apprentice is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Magecraft — Whenever you cast or copy an instant or sorcery spell, this creature can't be blocked this turn. If that spell has mana value 5 or greater, put a +1/+1 counter on this creature.

How it works : Prismari Apprentice

Original English text — Wizards of the Coast / Scryfall

#1April 16, 2021· Wizards of the Coast
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.
No other card is named in this ruling.
#2April 16, 2021· Wizards of the Coast
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.
No other card is named in this ruling.
#3April 16, 2021· Wizards of the Coast
If an effect creates a copy of an instant or sorcery spell, this will also cause the magecraft ability to trigger.
No other card is named in this ruling.
#4April 16, 2021· Wizards of the Coast
If an effect creates multiple copies of an instant or sorcery spell, magecraft abilities trigger once for each copy created by the effect.
No other card is named in this ruling.
#5April 16, 2021· Wizards of the Coast
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.
No other card is named in this ruling.