For whom the bell tolls.

A not so surreptitious version of the Mysterious Challenger?

    Bellringer Sentry
    Class: Paladin
    Card type: Minion
    Rarity: Rare
    Mana cost: 4
    Attack: 3 HP: 4
    Card text: Battlecry and Deathrattle: Put a Secret from your deck into the battlefield.

On one hand, this card could be annoying to play against. On the other hand, seeing this card played on Turn 4 instead of Call to Arms will be the lesser of two evils.