Nalia de'Arnise — ruling 1

The top card of your library isn't in your hand, so you can't take other actions that would normally be allowed from your hand, such as discarding it due to an effect or activating a cycling ability.

Nalia de'Arnise — ruling 2

You have a "full party" if the number of creatures in your party is four (that is, you control a Cleric, a Rogue, a Warrior, and a Wizard, and they are four different creatures).

Nalia de'Arnise — ruling 3

You can look at the top card of your library whenever you want (with one restriction; see below), even if you don't have priority. This action doesn't use the stack. Knowing what that card is becomes part of the information you have access to, just like you can look at the cards in your hand.

Nalia de'Arnise — ruling 4

If the top card of your library changes while you're casting a spell, playing a land, or activating an ability, you can't look at the new top card until you finish doing so. This means that if you cast a spell from the top of your library, you can't look at the next one until you're done paying for that spell.

Nalia de'Arnise — ruling 5

Nalia doesn't change when you can cast spells. Normally, this means during your main phase when the stack is empty, although flash may change this.

Nalia de'Arnise — ruling 6

You'll still pay all costs for the spell, including additional costs. You may also pay alternative costs if any are available.

Nalia de'Arnise — ruling 7

Nalia's last ability will check whether you have a full party at the beginning of combat on your turn. If you don't, the ability won't trigger. If the ability does trigger, it will check again as it tries to resolve. If you don't have a full party at that time, the ability won't resolve and none of its effects will happen.

Nalia de'Arnise — ruling 8

After the last ability has resolved, no longer having a full party won't cause any of the creatures that gained deathtouch to lose it.

Nalia de'Arnise : règles, fonctionnement et interactions (MTG)

Nalia de'Arnise 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

You may look at the top card of your library any time. You may cast Cleric, Rogue, Warrior, and Wizard spells from the top of your library. At the beginning of combat on your turn, if you have a full party, put a +1/+1 counter on each creature you control and those creatures gain deathtouch until end of turn.

How it works : Nalia de'Arnise

Original English text — Wizards of the Coast / Scryfall

#1June 10, 2022· Wizards of the Coast
The top card of your library isn't in your hand, so you can't take other actions that would normally be allowed from your hand, such as discarding it due to an effect or activating a cycling ability.
No other card is named in this ruling.
#2June 10, 2022· Wizards of the Coast
You have a "full party" if the number of creatures in your party is four (that is, you control a Cleric, a Rogue, a Warrior, and a Wizard, and they are four different creatures).
No other card is named in this ruling.
#3June 10, 2022· Wizards of the Coast
You can look at the top card of your library whenever you want (with one restriction; see below), even if you don't have priority. This action doesn't use the stack. Knowing what that card is becomes part of the information you have access to, just like you can look at the cards in your hand.
No other card is named in this ruling.
#4June 10, 2022· Wizards of the Coast
If the top card of your library changes while you're casting a spell, playing a land, or activating an ability, you can't look at the new top card until you finish doing so. This means that if you cast a spell from the top of your library, you can't look at the next one until you're done paying for that spell.
No other card is named in this ruling.
#5June 10, 2022· Wizards of the Coast
Nalia doesn't change when you can cast spells. Normally, this means during your main phase when the stack is empty, although flash may change this.
No other card is named in this ruling.
#6June 10, 2022· Wizards of the Coast
You'll still pay all costs for the spell, including additional costs. You may also pay alternative costs if any are available.
No other card is named in this ruling.
#7June 10, 2022· Wizards of the Coast
Nalia's last ability will check whether you have a full party at the beginning of combat on your turn. If you don't, the ability won't trigger. If the ability does trigger, it will check again as it tries to resolve. If you don't have a full party at that time, the ability won't resolve and none of its effects will happen.
No other card is named in this ruling.
#8June 10, 2022· Wizards of the Coast
After the last ability has resolved, no longer having a full party won't cause any of the creatures that gained deathtouch to lose it.
No other card is named in this ruling.