Nadu, Winged Wisdom — ruling 1

Nadu, Winged Wisdom's last ability grants a triggered ability to itself as well as other creatures you control.

Nadu, Winged Wisdom — ruling 2

The ability that Nadu grants to each creature you control functions independently for each creature. Specifically, the ability can trigger twice each turn for each creature you control, not just twice total.

Nadu, Winged Wisdom — ruling 3

If Nadu leaves the battlefield while one or more triggered abilities generated by the ability it grants are still on the stack, those abilities will still resolve as normal.

Nadu, Winged Wisdom — ruling 4

If Nadu somehow enters the battlefield while a spell or ability that targets a creature you control is on the stack, the ability granted by Nadu won't trigger since that creature didn't have that ability when it became the target of that spell or ability.

Nadu, Winged Wisdom — ruling 5

If you somehow control more than one Nadu, each permanent you control will have that many instances of the granted ability. These abilities are not redundant. For example, if you control two Nadus and one becomes the target of a spell or ability, each of its granted abilities will trigger. If that same Nadu becomes the target of a spell or ability again later in the turn, each of its granted abilities will trigger again, as each of them have triggered only once so far this turn.

Nadu, Winged Wisdom — ruling 6

If Nadu leaves the battlefield and returns to the battlefield in the same turn, or if Nadu leaves and another Nadu appears, the triggered ability granted by the new one is different than the triggered ability granted by the old one. The one granted by the new Nadu may trigger twice for each creature you control, even if the ability granted by the old Nadu already triggered twice for those creatures that turn. (Note that creatures you control won't have the ability granted by the old one anymore, and if you control multiple Nadus, you won't have the opportunity to take actions before the "legend rule" gets you down to one Nadu.)

Nadu, Winged Wisdom : règles, fonctionnement et interactions (MTG)

Nadu, Winged Wisdom 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

Flying Creatures you control have "Whenever this creature becomes the target of a spell or ability, reveal the top card of your library. If it's a land card, put it onto the battlefield. Otherwise, put it into your hand. This ability triggers only twice each turn."

How it works : Nadu, Winged Wisdom

Original English text — Wizards of the Coast / Scryfall

#1June 7, 2024· Wizards of the Coast
Nadu, Winged Wisdom's last ability grants a triggered ability to itself as well as other creatures you control.
No other card is named in this ruling.
#2June 7, 2024· Wizards of the Coast
The ability that Nadu grants to each creature you control functions independently for each creature. Specifically, the ability can trigger twice each turn for each creature you control, not just twice total.
No other card is named in this ruling.
#3June 7, 2024· Wizards of the Coast
If Nadu leaves the battlefield while one or more triggered abilities generated by the ability it grants are still on the stack, those abilities will still resolve as normal.
No other card is named in this ruling.
#4June 7, 2024· Wizards of the Coast
If Nadu somehow enters the battlefield while a spell or ability that targets a creature you control is on the stack, the ability granted by Nadu won't trigger since that creature didn't have that ability when it became the target of that spell or ability.
No other card is named in this ruling.
#5June 7, 2024· Wizards of the Coast
If you somehow control more than one Nadu, each permanent you control will have that many instances of the granted ability. These abilities are not redundant. For example, if you control two Nadus and one becomes the target of a spell or ability, each of its granted abilities will trigger. If that same Nadu becomes the target of a spell or ability again later in the turn, each of its granted abilities will trigger again, as each of them have triggered only once so far this turn.
No other card is named in this ruling.
#6June 7, 2024· Wizards of the Coast
If Nadu leaves the battlefield and returns to the battlefield in the same turn, or if Nadu leaves and another Nadu appears, the triggered ability granted by the new one is different than the triggered ability granted by the old one. The one granted by the new Nadu may trigger twice for each creature you control, even if the ability granted by the old Nadu already triggered twice for those creatures that turn. (Note that creatures you control won't have the ability granted by the old one anymore, and if you control multiple Nadus, you won't have the opportunity to take actions before the "legend rule" gets you down to one Nadu.)
No other card is named in this ruling.