Cheapest priced copy (Midnight Hunt Commander): $1.99 at Card Kingdom, near mint, their price list as of .
Sigarda's Vanguard 
Creature — Angel · 3/3 · Rare · Midnight Hunt Commander · #46
Flash
Flying
Whenever this creature enters or attacks, choose any number of creatures with different powers. Those creatures gain double strike until end of turn.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $1.99 to $2.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Midnight Hunt Commander | 8 | Rare | $1.99 | — |
| Midnight Hunt Commander | 46 | Rare | $2.49Out of stock | — |
2 rulings from Wizards of the Coast
- 24 September 2021No creatures are targeted by Sigarda's Vanguard's ability. The set of creatures is chosen as the ability resolves. You may choose a single creature as a valid set. If you do, that creature will gain double strike until end of turn.
- 24 September 2021A set of creatures has different powers if every creature's power is a different value. For example, a 1/1 creature, a 2/1 creature, and a 3/1 creature all have different powers.