Do keep in mind, though, that they are not the same character
They also won't trigger if a card on the battlefield transforms into a legendary permanent
Product fatigue hitting
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7 Kefka, Court Mage/Kefka, Ruler Of Ruin - $125 Full-Art Surge Foil The big bad of Final Fantasy 6, Kefka is one of the few antagonists who actually beat the heroes, at least for a time