Dokuchi Shadow-Walker — ruling 1

The ninjutsu ability can be activated only after blockers have been declared. Before then, attacking creatures are neither blocked nor unblocked.

Dokuchi Shadow-Walker — ruling 2

As you activate a ninjutsu ability, you reveal the Ninja card in your hand and return the attacking creature. The Ninja card stays revealed and isn't put onto the battlefield until the ability resolves. If it leaves your hand before then, it won't enter the battlefield at all.

Dokuchi Shadow-Walker — ruling 3

The creature with ninjutsu enters the battlefield attacking the same player or planeswalker that the returned creature was attacking. This is a rule specific to ninjutsu; in other cases, when a creature is put onto the battlefield attacking, that creature's controller chooses which player or planeswalker it's attacking.

Dokuchi Shadow-Walker — ruling 4

Although the Ninja is attacking, it was never declared as an attacking creature (for purposes of abilities that trigger whenever a creature attacks, for example).

Dokuchi Shadow-Walker — ruling 5

The ninjutsu ability can be activated during the declare blockers step, combat damage step, or end of combat step. In most cases (see below), if you wait until the combatdamage step or end of combat step, it will be after combat damage has been dealt, so the Ninja won't deal combat damage.

Dokuchi Shadow-Walker — ruling 6

If a creature in combat has first strike or double strike, you can activate the ninjutsu ability during the first-strike combat damage step. The Ninja will deal combat damage during the regular combat damage step, even if it has first strike.

Dokuchi Shadow-Walker : règles, fonctionnement et interactions (MTG)

Dokuchi Shadow-Walker 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

Ninjutsu (, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)

How it works : Dokuchi Shadow-Walker

Original English text — Wizards of the Coast / Scryfall

#1February 18, 2022· Wizards of the Coast
The ninjutsu ability can be activated only after blockers have been declared. Before then, attacking creatures are neither blocked nor unblocked.
No other card is named in this ruling.
#2February 18, 2022· Wizards of the Coast
As you activate a ninjutsu ability, you reveal the Ninja card in your hand and return the attacking creature. The Ninja card stays revealed and isn't put onto the battlefield until the ability resolves. If it leaves your hand before then, it won't enter the battlefield at all.
No other card is named in this ruling.
#3February 18, 2022· Wizards of the Coast
The creature with ninjutsu enters the battlefield attacking the same player or planeswalker that the returned creature was attacking. This is a rule specific to ninjutsu; in other cases, when a creature is put onto the battlefield attacking, that creature's controller chooses which player or planeswalker it's attacking.
No other card is named in this ruling.
#4February 18, 2022· Wizards of the Coast
Although the Ninja is attacking, it was never declared as an attacking creature (for purposes of abilities that trigger whenever a creature attacks, for example).
No other card is named in this ruling.
#5February 18, 2022· Wizards of the Coast
The ninjutsu ability can be activated during the declare blockers step, combat damage step, or end of combat step. In most cases (see below), if you wait until the combatdamage step or end of combat step, it will be after combat damage has been dealt, so the Ninja won't deal combat damage.
No other card is named in this ruling.
#6February 18, 2022· Wizards of the Coast
If a creature in combat has first strike or double strike, you can activate the ninjutsu ability during the first-strike combat damage step. The Ninja will deal combat damage during the regular combat damage step, even if it has first strike.
No other card is named in this ruling.
#7February 18, 2022· Wizards of the Coast
Puff of smoke not included.
No other card is named in this ruling.