Unnatural Selection

Enchantment

1U

1:choose creature type other than wall.  Target

creature becomes that type untill end of turn.

Flagbearers

If an opponent plays a spell or ability that can target a Flagbearer in

play, the opponent chooses at least one flagbearer.

With a flagbearer in play, use Unnatural Selection to switch its type to

another type (anything other than flagbearer).  This makes the

flagbearer an illegal target and the opponent must still target a

flagbearer.  We know the famous equation:

                Spell + illegal target = discard with no effect

Tell me if this works!