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.
Giving little thought to their own defense, they carried the flag that united their army.
![Coalition Honor Guard [Mystery Booster]](http://www.cardmerchanttakapuna.co.nz/cdn/shop/files/bc8c07f5-407c-5813-ab46-c677439c6e51.jpg?v=1768424615&width=1445)