Jadzi, Oracle of Arcavios // Journey to the Oracle — ruling 1

Putting a land onto the battlefield does not count as playing a land for the turn and doesn’t use the normal timing restrictions.

Jadzi, Oracle of Arcavios // Journey to the Oracle — ruling 2

You may choose not to cast a nonland card revealed by Jadzi’s triggered ability. If you don’t cast it, it stays on top of your library.

Jadzi, Oracle of Arcavios // Journey to the Oracle — ruling 3

If you’re casting the card you reveal with Jadzi’s ability, you ignore normal timing restrictions.

Jadzi, Oracle of Arcavios // Journey to the Oracle — ruling 4

If you reveal a modal double-faced card with Jadzi’s triggered ability, and both faces are nonland, you may cast either face by paying {1} rather than its mana cost. If only the back face is a land, you may cast the front face. If both faces are lands, you will put onto the battlefield front face up.

Jadzi, Oracle of Arcavios // Journey to the Oracle — ruling 5

If you cast a spell with {X} in its mana cost using Jadzi’s magecraft ability, you must choose 0 as the value of X.

Jadzi, Oracle of Arcavios // Journey to the Oracle — ruling 6

Because the magecraft ability supplies an alternative cost of {1} for the spell, you cannot pay any other alternative costs that may apply. However, you may pay additional costs and must pay any additional costs that are required.

Jadzi, Oracle of Arcavios // Journey to the Oracle — ruling 7

You may activate Jadzi’s activated ability only while Jadzi is on the battlefield. If Jadzi is no longer on the battlefield as the ability resolves, it won’t return her to your hand from any other zone.

Jadzi, Oracle of Arcavios // Journey to the Oracle — ruling 8

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.

Jadzi, Oracle of Arcavios // Journey to the Oracle : règles, fonctionnement et interactions (MTG)

Jadzi, Oracle of Arcavios // Journey to the Oracle 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

Discard a card: Return Jadzi to its owner's hand. Magecraft — Whenever you cast or copy an instant or sorcery spell, reveal the top card of your library. If it's a nonland card, you may cast it by paying rather than paying its mana cost. If it's a land card, put it onto the battlefield. You may put any number of land cards from your hand onto the battlefield. Then if you control eight or more lands, you may discard a card. If you do, return Journey to the Oracle to its owner's hand.

How it works : Jadzi, Oracle of Arcavios // Journey to the Oracle

Original English text — Wizards of the Coast / Scryfall

#1April 16, 2021· Wizards of the Coast
Putting a land onto the battlefield does not count as playing a land for the turn and doesn’t use the normal timing restrictions.
No other card is named in this ruling.
#2April 16, 2021· Wizards of the Coast
You may choose not to cast a nonland card revealed by Jadzi’s triggered ability. If you don’t cast it, it stays on top of your library.
No other card is named in this ruling.
#3April 16, 2021· Wizards of the Coast
If you’re casting the card you reveal with Jadzi’s ability, you ignore normal timing restrictions.
No other card is named in this ruling.
#4April 16, 2021· Wizards of the Coast
If you reveal a modal double-faced card with Jadzi’s triggered ability, and both faces are nonland, you may cast either face by paying rather than its mana cost. If only the back face is a land, you may cast the front face. If both faces are lands, you will put onto the battlefield front face up.
No other card is named in this ruling.
#5April 16, 2021· Wizards of the Coast
If you cast a spell with in its mana cost using Jadzi’s magecraft ability, you must choose 0 as the value of X.
No other card is named in this ruling.
#6April 16, 2021· Wizards of the Coast
Because the magecraft ability supplies an alternative cost of for the spell, you cannot pay any other alternative costs that may apply. However, you may pay additional costs and must pay any additional costs that are required.
No other card is named in this ruling.
#7April 16, 2021· Wizards of the Coast
You may activate Jadzi’s activated ability only while Jadzi is on the battlefield. If Jadzi is no longer on the battlefield as the ability resolves, it won’t return her to your hand from any other zone.
No other card is named in this ruling.
#8April 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.
#9April 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.
#10April 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.
#11April 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.
#12April 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.