嘲笑するドッペルゲンガー
クリーチャー — 多相の戦士
瞬速
嘲笑するドッペルゲンガーを、これが「このクリーチャーと同じ名前を持ちこれでないすべてのクリーチャーは使嗾される。」を持つことを除き、対戦相手がコントロールしているクリーチャー１体のコピーとして戦場に出してもよい。
Illustrated by
Commander Legends: Battle for Baldur's Gate#617RareJapaneseLegality
Rulings
Except for the added ability, Mocking Doppelganger copies exactly what was printed on the original creature (unless that creature is copying something else or is a token; see below). It doesn't copy whether that creature is tapped or untapped, whether it has any counters on it, whether it has any Auras and/or Equipment attached to it, or any non-copy effects that changed its power, toughness, types, color, and so on.
If the chosen creature is copying something else, Mocking Doppelganger will use the copiable values of the chosen creature. In most cases, it will be a copy of whatever the chosen creature is copying.
If Mocking Doppelganger somehow enters the battlefield at the same time as another creature an opponent controls, it can't become a copy of that creature. You may choose only a creature that's already on the battlefield.
Any enters-the-battlefield abilities of the copied creature will trigger when Mocking Doppelganger enters the battlefield. Any “as [this creature] enters the battlefield” or “[this creature] enters the battlefield with” abilities of the chosen creature will also work.
If the chosen creature is a token, Mocking Doppelganger copies the original characteristics of that token, except for the added ability. Mocking Doppelganger doesn't become a token in this case.
If the chosen creature has 
in its mana cost, X is considered to be 0.