Once per turn (Quick Effect): You can target 1 "Gouki" monster in your Main Monster Zone, except "Gouki The Solid Ogre"
As Jiminy Cricket sings: When you get in trouble and you don't know right from wrong, give a little whistle! #31
And there are actually fewer of these C1 commons (cards printed once per common sheet) than there are U4 Uncommons (cards printed 4x per Uncommon sheet)
Wizards of the Coast hasn't divulged just how unlikely it is to find this rarest of its Soul Stones, but it has noted that it's extremely rare and that it can only be found in collector boosters
From Pascal, Rapunzels Companion, the chameleon who gains camouflage (evasive) when around another character, to The Queen, Wicked and Vain, whose ability is to consult the Magic Mirror (to draw a card), the designs in Amethyst convey the characters and actions magnificently