Plargg and Nassari — ruling 1

In a multiplayer game, you choose an opponent to choose a nonland card exiled with Plargg and Nassari.

Plargg and Nassari — ruling 2

In a two-player game, assuming each player eventually exiles a nonland card, your opponent will choose one of them, and you'll be able to cast the other one.

Plargg and Nassari — ruling 3

If a spell has {X} in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.

Plargg and Nassari — ruling 4

If you cast a spell "without paying its mana cost," you can't pay any alternative costs. You can, however, pay additional costs. If the spell has any mandatory additional costs, those must be paid to cast it.

Plargg and Nassari — ruling 5

All the spells you cast due to the triggered ability are cast during the resolution of that ability. You can cast them in any order.

Plargg and Nassari — ruling 6

Cards not cast this way, including any land cards, remain in exile.

Plargg and Nassari — ruling 7

A spell you cast this way can be the target of a later spell you cast this way. However, permanent spells cast this way won't resolve until you're done casting spells, so the permanents they become can't be the target of spells cast this way. For example, if you exile Twincast and Lightning Strike, you can cast Lightning Strike and then cast Twincast targeting it, but if you exile a creature card and an Aura card, you can't cast that Aura targeting that creature.

Plargg and Nassari : règles, fonctionnement et interactions (MTG)

Plargg and Nassari 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

At the beginning of your upkeep, each player exiles cards from the top of their library until they exile a nonland card. An opponent chooses a nonland card exiled this way. You may cast up to two spells from among the other cards exiled this way without paying their mana costs.

How it works : Plargg and Nassari

Original English text — Wizards of the Coast / Scryfall

#1May 12, 2023· Wizards of the Coast
In a multiplayer game, you choose an opponent to choose a nonland card exiled with Plargg and Nassari.
No other card is named in this ruling.
#2May 12, 2023· Wizards of the Coast
In a two-player game, assuming each player eventually exiles a nonland card, your opponent will choose one of them, and you'll be able to cast the other one.
No other card is named in this ruling.
#3May 12, 2023· Wizards of the Coast
If a spell has in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.
No other card is named in this ruling.
#4May 12, 2023· Wizards of the Coast
If you cast a spell "without paying its mana cost," you can't pay any alternative costs. You can, however, pay additional costs. If the spell has any mandatory additional costs, those must be paid to cast it.
No other card is named in this ruling.
#5May 12, 2023· Wizards of the Coast
All the spells you cast due to the triggered ability are cast during the resolution of that ability. You can cast them in any order.
No other card is named in this ruling.
#6May 12, 2023· Wizards of the Coast
Cards not cast this way, including any land cards, remain in exile.
No other card is named in this ruling.
#7May 12, 2023· Wizards of the Coast
A spell you cast this way can be the target of a later spell you cast this way. However, permanent spells cast this way won't resolve until you're done casting spells, so the permanents they become can't be the target of spells cast this way. For example, if you exile Twincast and Lightning Strike, you can cast Lightning Strike and then cast Twincast targeting it, but if you exile a creature card and an Aura card, you can't cast that Aura targeting that creature.
No other card is named in this ruling.