The Portuguese version of of this card from Starter Deck: Yugi seems to be a misprint. The name is "Elfo Mística", which should have been mistyped because "elfo" is a masculine noun and "mística" is a feminine adjective. And yet, the monster is referred to as an "elfa" (feminine) in the flavor text. See the errata.
This card's OCG/TCG artwork is taken from Yu-Gi-Oh! Duel 010, specifically from the panel when Yugi summons this monster.