FOILCheapest priced copy (Foundations Commander): $3.99 at Card Kingdom, near mint, their price list as of .
Misleading Signpost 
Artifact · Rare · Secret Lair Drop · #2127
Flash
When this artifact enters during the declare attackers step, you may reselect which player or permanent target attacking creature is attacking. (It can't attack its controller or their permanents.)
{T}: Add {U}.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
5 printings · $3.99 to $17.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Foundations Commander | 69 | Rare | $3.99 | — |
| The List | WOC-11 | Rare | — | — |
| Secret Lair Drop | 2127 | Rare | — | — |
| Wilds of Eldraine Commander | 11 | Rare | $12.99 | — |
| Wilds of Eldraine Commander | 47 | Rare | $17.99 | — |
5 rulings from Wizards of the Coast
- 1 September 2023Reselecting which player or permanent a creature is attacking doesn't cause "whenever this creature attacks" abilities to trigger.
- 1 September 2023You may cast Misleading Signpost outside of a declare attackers step. If Misleading Signpost enters the battlefield outside of a declare attackers step, its ability simply doesn't trigger.
- 1 September 2023If an ability targets something controlled by the "defending player" of an attacking creature and the defending player for that creature changes before that ability resolves, the ability won't resolve because its target has become illegal.
- 1 September 2023If you reselect which player or permanent an attacking creature is attacking, that creature is still considered to have attacked the player or permanent as declared, but it is now attacking the new player or permanent.
- 1 September 2023Reselecting which player or permanent a creature is attacking ignores all requirements, restrictions, and costs associated with attacking.