Rona, Disciple of Gix — ruling 1

If Rona leaves the battlefield, the exiled cards will remain exiled indefinitely. If Rona enters the battlefield again, it won't be associated with the cards the "other" Rona exiled. The new Rona will exile a new set of cards with its first and last abilities. Only those cards can be cast using the new Rona's middle ability.

Rona, Disciple of Gix — ruling 2

The cards exiled from your library are exiled face up.

Rona, Disciple of Gix — ruling 3

After Rona's last ability resolves, you have priority if it's your turn. You can cast the exiled card before any player can take other actions if it's legal to do so.

Rona, Disciple of Gix — ruling 4

You must follow the normal timing permissions and restrictions of the cards you cast from exile.

Rona, Disciple of Gix — ruling 5

You'll still pay all costs for that spell, including additional costs. You may also pay alternative costs such as that granted by Jodah, Archmage Eternal.

Rona, Disciple of Gix — ruling 6

The exiled cards aren't in your hand, so you can't cycle them, discard them, or activate any of their activated abilities.

Rona, Disciple of Gix — ruling 7

Once you begin to cast a card, losing control of Rona won't affect the spell.

Rona, Disciple of Gix — ruling 8

The card you'll exile from the top of your library is determined as Rona's last ability resolves. This might not be the card that was on top of your library when you activated that ability.

Rona, Disciple of Gix : règles, fonctionnement et interactions (MTG)

Rona, Disciple of Gix 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

When Rona enters, you may exile target historic card from your graveyard. (Artifacts, legendaries, and Sagas are historic.) You may cast spells from among cards exiled with Rona. , : Exile the top card of your library.

How it works : Rona, Disciple of Gix

Original English text — Wizards of the Coast / Scryfall

#1April 27, 2018· Wizards of the Coast
If Rona leaves the battlefield, the exiled cards will remain exiled indefinitely. If Rona enters the battlefield again, it won't be associated with the cards the "other" Rona exiled. The new Rona will exile a new set of cards with its first and last abilities. Only those cards can be cast using the new Rona's middle ability.
No other card is named in this ruling.
#2April 27, 2018· Wizards of the Coast
The cards exiled from your library are exiled face up.
No other card is named in this ruling.
#3April 27, 2018· Wizards of the Coast
After Rona's last ability resolves, you have priority if it's your turn. You can cast the exiled card before any player can take other actions if it's legal to do so.
No other card is named in this ruling.
#4April 27, 2018· Wizards of the Coast
You must follow the normal timing permissions and restrictions of the cards you cast from exile.
No other card is named in this ruling.
#5April 27, 2018· Wizards of the Coast
You'll still pay all costs for that spell, including additional costs. You may also pay alternative costs such as that granted by Jodah, Archmage Eternal.
No other card is named in this ruling.
#6April 27, 2018· Wizards of the Coast
The exiled cards aren't in your hand, so you can't cycle them, discard them, or activate any of their activated abilities.
No other card is named in this ruling.
#7April 27, 2018· Wizards of the Coast
Once you begin to cast a card, losing control of Rona won't affect the spell.
No other card is named in this ruling.
#8April 27, 2018· Wizards of the Coast
The card you'll exile from the top of your library is determined as Rona's last ability resolves. This might not be the card that was on top of your library when you activated that ability.
No other card is named in this ruling.
#9April 27, 2018· Wizards of the Coast
A card, spell, or permanent is historic if it has the legendary supertype, the artifact card type, or the Saga subtype. Having two of those qualities doesn't make an object more historic than another or provide an additional bonus—an object either is historic or it isn't.
No other card is named in this ruling.