What are the orders of a king or the demands of a creed next to such melodies?

Was sind die Befehle eines Königs oder die eigene Überzeugung nebst solcher Melodien?

Liebliche Sirenen

{U}, {T}: Eine Kreatur deiner Wahl greift einen Gegner deiner Wahl in diesem Zug an, falls möglich.
Morph {U} (Du kannst diese Karte verdeckt für {3} als eine 2/2 Kreatur wirken. Decke sie zu einem beliebigen Zeitpunkt für ihre Morph-Kosten auf.)

¿Qué son las órdenes de un rey o las exigencias de un credo frente a tales melodías?

Sirenas melodiosas

{U}, {T}: La criatura objetivo ataca al oponente objetivo este turno si puede.
Metamorfosis {U}. (Puedes lanzar esta carta boca abajo como una criatura 2/2 pagando {3}. Ponla boca arriba en cualquier momento pagando su coste de metamorfosis.)

Face à pareille mélodie, quel poids ont les ordres d'un roi ou les exigences d'un dogme ?

Sirènes suaves

{U}, {T} : La créature ciblée attaque l'adversaire ciblé ce tour-ci si possible.
Mue {U} (Vous pouvez lancer cette carte face cachée comme une créature 2/2 pour {3}. Retournez-la à tout moment pour son coût de mue.)

Cosa valgono gli ordini di un re o gli obblighi della fede di fronte a simili melodie?

Sirene Soavi

{U}, {T}: Una creatura bersaglio attacca un avversario bersaglio in questo turno, se può farlo.
Metamorfosi {U} (Puoi lanciare questa carta a faccia in giù come una creatura 2/2 pagando {3}. Girala a faccia in su in qualsiasi momento pagando il suo costo di metamorfosi.)

このような旋律に比べれば、王の命令や信条が求める要求などさしたるものではない。

美旋律のセイレーン

{U}, {T}：クリーチャー１体と対戦相手１人を対象とする。このターン、そのクリーチャーは可能ならそのプレイヤーを攻撃する。
変異{U}（あなたはこのカードを、{3}で２/２クリーチャーとして裏向きに唱えてもよい。これの変異コストで、これをいつでも表向きにしてよい。）

但闻如此美妙旋律，哪还理得了许多君命与教义？

悦曲塞连

{U}，{T}：目标生物本回合若能攻击目标对手，则必须如此作。
变身{U}（你可牌面朝下地施放此牌并支付{3}，将其当成2/2生物。可随时支付其变身费用使其翻回正面。）

Dulcet Sirens

{U}, {T}: Target creature attacks target opponent this turn if able.
Morph {U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

Commander 2014

If either the target creature or the target player is an illegal target when the activated ability tries to resolve, the ability will have no effect. The creature won’t be forced to attack that opponent, but it still can if able.

If the creature can’t attack the player for one of the above reasons but it can still attack elsewhere, its controller may choose to have it attack another player, attack a planeswalker, or not attack at all.

If, as attackers are declared, the target creature is tapped, is affected by a spell or ability that says it can’t attack, or hasn’t been under its controller’s control continuously since their last turn began (and doesn’t have haste), then it doesn’t attack. If there’s a cost associated with having the creature attack the opponent, its controller isn’t forced to pay that cost, so it doesn’t have to attack that player in that case either.

The target creature must attack the target opponent if able, not a planeswalker controlled by that player.

“Target opponent” means one of your opponents. In other words, Dulcet Sirens’s ability can’t make a creature attack you.