Cheapest priced copy (Dominaria Remastered): $0.35 at Card Kingdom, near mint, their price list as of .
Phantom Flock 
Creature — Bird Soldier Spirit · 0/0 · Uncommon · Judgment · #16
Flying
This creature enters with three +1/+1 counters on it.
If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
5 printings · $0.35 to $2.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Dominaria Remastered | 20 | Common | $0.35 | $0.49 |
| Judgment | 16 | Uncommon | $0.35 | $2.99 |
| The List | JUD-16 | Uncommon | $0.35 | — |
| Salvat 2005 | C3 | Uncommon | — | — |
| Salvat 2005 | C39 | Uncommon | — | — |
3 rulings from Wizards of the Coast
- 8 December 2022If this creature would be dealt damage from multiple sources at the same time (say, because it's blocked by multiple creatures), all of the damage is prevented and only one +1/+1 counter is removed.
- 8 December 2022If damage that would be dealt to this creature can't be prevented, the damage is dealt and a +1/+1 counter is removed from this creature.
- 8 December 2022If this creature has no +1/+1 counters on it (but is still on the battlefield because something else is raising its toughness), damage that would be dealt to it is still prevented.