Cheapest priced copy (Midnight Hunt Commander): $0.49 at Card Kingdom, near mint, their price list as of .
Sigardian Zealot 
Creature — Human Cleric · 3/3 · Rare · Midnight Hunt Commander · #67
At the beginning of combat on your turn, choose any number of creatures with different powers. Each of them gets +X/+X and gains vigilance until end of turn, where X is this creature's power.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Midnight Hunt Commander | 29 | Rare | $0.49 | — |
| Midnight Hunt Commander | 67 | Rare | $0.49 | — |
2 rulings from Wizards of the Coast
- 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.
- 24 September 2021No creatures are targeted by Sigardian Zealot'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 get +X/+X and gain vigilance until end of turn.