Cheapest priced copy (Apocalypse): $0.35 at Card Kingdom, near mint, their price list as of .
Coalition Honor Guard 
Creature — Human Flagbearer · 2/4 · Common · Apocalypse · #3
While an opponent is choosing targets as part of casting a spell they control or activating an ability they control, that player must choose at least one Flagbearer on the battlefield if able.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
3 printings · $0.35 to $4.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Apocalypse | 3 | Common | $0.35 | $4.99 |
| Eternal Masters | 6 | Common | $0.35 | $0.79 |
| The List | EMA-6 | Common | $0.35 | — |
3 rulings from Wizards of the Coast
- 8 June 2016Any player’s Flagbearer may be targeted. For example, if each player controls a Coalition Honor Guard, Seal of Strength’s ability may target any of them.
- 8 June 2016If a spell or ability’s targets are changed, or if a copy of a spell or ability is put onto the stack and has new targets chosen, it doesn’t have to target a Flagbearer.
- 8 June 2016Activated abilities contain a colon. They’re generally written “[Cost]: [Effect].” Some keywords are activated abilities and will have colons in their reminder text. Triggered abilities (written with “when,” “whenever,” or “at”) don’t have to target a Flagbearer.