Fanged Flight - 1 Mana, Common Druid Spell.
Give a friendly minion Rush. After it attacks, return it to your hand.
Simple. It's a cheap spell to grant rush, with the potential drawback (or potential benefit) of returning it to your hand afterwards, whether it lives or dies. Obviously, this card synergises best with low-cost, low-health, and high-attack battlecry cards, but it can be used with a bigger minion in a pinch, even if it means losing board presence.
As you might guess by the card art and name, it's themed after beasts, the Wolpertinger in particular.
Shaman exclusive 4 mana 3/2 weapon, flavor text: while equipped, your minions cost (1) less.
References murlocs, I thought it would be cool to have a card that synergises with murlocs considering how the murloc shaman theme was pushed a little in RoS. it works a lot like scargil with the whole mana reduction thing, but you can also swing for 3 extra damage whenever you don't need the effect anymore or if you need to contest the board more or even maybe for lethal if you have it. Plus it's much harder for your opponent to deal with a weapon rather than a 4/4 because they need to specifically run weapon removal.