Valeria, Elite Honorguard

Arcanashield, Flagbearer (While choosing targets as part of casting a spell or activating an ability, your opponents must choose at least one creature with flagbearer on the battlefield if able.)
Shielding 4 (This creature enters play with a shield counter on it. As long as this creature has a shield counter on it, it has indestructible. When this creature is dealt 4 or more damage from a source, remove a shield counter from this creature.)