Cheapest priced copy (March of the Machine: The Aftermath): $0.49 at Card Kingdom, near mint, their price list as of .
Nashi, Moon's Legacy 
Legendary Creature — Rat Shaman · 3/4 · Rare · March of the Machine: The Aftermath · #174
Menace, ward {1}
Whenever Nashi attacks, exile up to one target legendary or Rat card from your graveyard and copy it. You may cast the copy. (You still pay its costs. A copy of a permanent spell becomes a token.)
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $0.49 to $5.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| March of the Machine: The Aftermath | 39 | Rare | $0.49 | $0.49 |
| March of the Machine: The Aftermath | 89 | Rare | $0.99 | $0.49 |
| March of the Machine: The Aftermath | 139 | Rare | — | — |
| March of the Machine: The Aftermath | 174 | Rare | $0.49 | $0.49 |
| March of the Machine: The Aftermath | 218 | Rare | — | $5.99 |
3 rulings from Wizards of the Coast
- 12 May 2023If you don't want to cast the copy, you can choose not to; the copy ceases to exist the next time state-based actions are performed.
- 12 May 2023You cast the copy while the ability is resolving and still on the stack. You can't wait to cast it later in the turn.
- 12 May 2023Because you're paying the spell's costs, if the spell has {X} in its mana cost, you may choose its value as normal.