It also has some text to force opponents to block it with multiple creatures
You may ignore a Trap's alternative cost condition and simply cast it for its normal mana cost
By consistently putting opponents to sleep, you can dictate the pace of the game and create opportunities to outmaneuver tougher decks like Pikachu ex and Mewtwo ex
This one sticks around to do it multiple times (without shrinking them like Glistening Oil), and even provides a bonus buff as long as you dont mind the risk of sacrificing the creature
I personally love otters, since theyre one of my favorite animals and I really like spellslinger decks, but mice are definitely a close second
Still, in formats where this is viable, it does represent up to one additional Mercenary token per turn and a buff that makes it very difficult for your opponents to block