Goldschwanz-Lehrmeister

Aura- und Ausrüstung-Zaubersprüche, die du wirkst, kosten beim Wirken {X} weniger, wobei X gleich der Stärke des Goldschwanz-Lehrmeisters ist.
Immer wenn der Goldschwanz-Lehrmeister angreift, erhalten andere modifizierte Kreaturen, die du kontrollierst, bis zum Ende des Zuges +X/+X, wobei X gleich der Stärke des Goldschwanz-Lehrmeisters ist. (Auren, die du kontrollierst, Ausrüstungen und Marken sind Modifizierungen.)

Entrenador de Cola Dorada

Te cuesta {X} menos lanzar hechizos de Aura y Equipo, donde X es la fuerza del Entrenador de Cola Dorada.
Siempre que el Entrenador de Cola Dorada ataque, las otras criaturas modificadas que controlas obtienen +X/+X hasta el final del turno, donde X es la fuerza del Entrenador de Cola Dorada. (Las Auras que controlas, los Equipos y los contadores son modificaciones.)

Instructeur Queue-dorée

Les sorts d'aura et d'équipement que vous lancez coûtent {X} de moins à lancer, X étant la force de l'Instructeur Queue-dorée.
À chaque fois que l'Instructeur Queue-dorée attaque, les autres créatures modifiées que vous contrôlez gagnent +X/+X jusqu'à la fin du tour, X étant la force de l'Instructeur Queue-dorée. (Les équipements, les auras que vous contrôlez et les marqueurs sont des modifications.)

Addestratore Coda-d'Oro

Le magie Aura ed Equipaggiamento che lanci costano {X} in meno per essere lanciate, dove X è la forza dell'Addestratore Coda-d'Oro.
Ogniqualvolta l'Addestratore Coda-d'Oro attacca, le altre creature modificate che controlli prendono +X/+X fino alla fine del turno, dove X è la forza dell'Addestratore Coda-d'Oro. (Equipaggiamenti, Aure che controlli e segnalini sono modifiche.)

金之尾の教練者

あなたがオーラや装備品である呪文を唱えるためのコストは{X}少なくなる。Ｘは、金之尾の教練者のパワーに等しい。
金之尾の教練者が攻撃するたび、ターン終了時まで、あなたがコントロールしていて改善されていてこれでないすべてのクリーチャーは＋Ｘ/＋Ｘの修整を受ける。Ｘは、金之尾の教練者のパワーに等しい。（装備品やあなたがコントロールしているオーラがついているかカウンターが置かれているクリーチャーは改善されている。）

Treinador Cauda Dourada

As mágicas de Aura e Equipamento que você conjura custam {X} a menos para serem conjuradas, sendo X o poder de Treinador Cauda Dourada.
Toda vez que Treinador Cauda Dourada ataca, as outras criaturas modificadas que você controla recebem +X/+X até o final do turno, sendo X o poder de Treinador Cauda Dourada. (Os Equipamentos, as Auras que você controla e os marcadores são modificações.)

金尾训练师

你施放的灵气与武具咒语减少{X}来施放，X为金尾训练师的力量。
每当金尾训练师攻击时，由你操控且有饰装的其他生物得+X/+X直到回合结束，X为金尾训练师的力量。（武具，指示物，以及由你操控的灵气均为饰装。）

Golden-Tail Trainer

Aura and Equipment spells you cast cost {X} less to cast, where X is Golden-Tail Trainer's power.
Whenever Golden-Tail Trainer attacks, other modified creatures you control get +X/+X until end of turn, where X is Golden-Tail Trainer's power. (Equipment, Auras you control, and counters are modifications.)

Modern Horizons 3

A creature that is equipped is considered modified no matter who controls the Equipment that's attached to it.

A creature with a counter on it is considered modified no matter what kind of counter it is or which player put it on that creature.

All costs to cast a spell are locked in before mana abilities are activated and those costs are paid. If Golden-Tail Trainer's power changes after costs are locked in, or if Golden-Tail Trainer leaves the battlefield while you are activating mana abilities or paying those costs, the cost reduction effect won't be affected and the total cost to cast the spell won't change.

An Aura controlled by another player does not cause a creature you control to be modified.

Only creatures can be modified. If a modified creature stops being a creature, it is no longer considered modified.

The value of X in Golden-Tail Trainer's last ability is determined only as the ability resolves.

To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases, then apply any cost reductions. The mana value of the spell remains unchanged, no matter what the total cost to cast it was.