Not necessarily, for what it's worth, it's a tad different from silence.

• It replaces/gives a minion the Murloc tribe. Replacing a minion's tribe may not be worth 1 mana (hell, of course it isn't) but it does allow a couple things. First, it removes any synergy it has with other cards your opponent may have. Second, it helps you (if you're playing this in a murloc pally) transform a minion you don't need into one you can use (because of Murloc type).

• Using this on a damaged minion removes any possibility of it healing back up from its current state. This isn't very big, but is a small helping hand against a big guy you can't take down immediately (only if your opponent plays/heals his minions, though).