Coalition Honor Guard {3}{W}
Creature — Human Flagbearer
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.
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Cards that do something similar expected a card that isn't here?
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Coalition Flag 100%
$0.29#24642
"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."