Coalition Honor Guard

Creature - Human Flagbearer 2/4, 3W (4)
While choosing targets as part of casting a spell or activating an ability, your opponents must choose at least one Flagbearer on the battlefield if able.¹
Giving little thought to their own defense, they carried the flag that united their army.
Illus. Eric Peterson

Gatherer Card Rulings [Nov 2009]

• 8/1/2008: Having a Flagbearer enter play after targets are chosen will not cause it's ability to trigger, so the spell will retain its original targets.

Format Legality	Legal in Vintage, Legacy Banned in Extended, Standard
Printings (1/6)	Apocalypse (Common)