Battlecry and aura effects

In a recent game against shaman, the tiny fin murloc battlecry summon benifits from double aura effects. Battlecry should take effect from hand not on board, as hero cards and locations ect do! However not only did the battlecry minion summon a copy with the added aura effects (not in hand buff) but recieved an extra buff while being on board itself.

Murloc Tinyfin does not have a battlecry:

Common · Minion · League of Explorers ·

Can you please explain what actual card you are talking about?