1 mana 1/1 tradeable with decent, well supported tribe tag would still be bonkers.
1 mana 1/1 tradeable Murlock would be instant include in every Murlock deck. Murlocks love cheap minions and ability to trade them for something different when you don't need cheap minions on the field anymore is great.
There was once a minion that was getting +1/+1 every time you draw a card, right? I don't remember it's name or if it's still in standard but i can imagine that slamming in on board and then in next turn trading bunch of cards can be really stupid.