Cheapest priced copy (Betrayers of Kamigawa): $2.99 at Card Kingdom, near mint, their price list as of .
Ninja of the Deep Hours 
Creature — Human Ninja · 2/2 · Common · Betrayers of Kamigawa · #44
Ninjutsu {1}{U} ({1}{U}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)
Whenever this creature deals combat damage to a player, you may draw a card.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
12 printings · $2.99 to $49.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Betrayers of Kamigawa | 44 | Common | $2.99 | $27.99 |
| Commander 2015 | 99 | Common | $2.99 | — |
| Commander 2018 | 95 | Common | $3.49 | — |
| Foundations Jumpstart | 108 | Common | $2.99 | — |
| Planechase 2012 | 21 | Common | $3.49 | — |
| Planechase Anthology | 21 | Common | $2.99 | — |
| The List | C18-95 | Common | $2.99 | — |
| Salvat 2005 | E6 | Common | — | — |
| Salvat 2005 | E30 | Common | — | — |
| Salvat 2005 | E41 | Common | — | — |
| Secret Lair Drop | 1912 | Rare | $19.99 | $24.99 |
| Time Spiral Remastered | 313 | Special | $5.99 | $49.99 |
6 rulings from Wizards of the Coast
- 19 March 2021The ninjutsu ability can be activated during the declare blockers step, combat damage step, or end of combat step. If you wait until after the declare blockers step, because all combat damage is dealt at once, the Ninja won't normally deal combat damage.
- 19 March 2021Although the Ninja is attacking, it was never declared as an attacking creature (for purposes of abilities that trigger whenever a creature attacks, for example).
- 19 March 2021The creature put onto the battlefield with ninjutsu enters the battlefield attacking the same player or planeswalker that the returned creature was attacking. This is a rule specific to ninjutsu.
- 19 March 2021As you activate a ninjutsu ability, you reveal the Ninja card in your hand and return the attacking creature. The Ninja 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.
- 19 March 2021If 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 in this case, even if it has first strike.
- 19 March 2021The ninjutsu ability can be activated only after blockers have been declared. Before then, attacking creatures are neither blocked nor unblocked.