To his dismay, he could not both fight and keep hold of his treasure.

Zu seinem Entsetzen konnte er nicht gleichzeitig kämpfen und seinen Schatz festhalten.

Schatzmopser

Immer wenn ein Gegner ein Artefakt für Mana tappt, übernimm bis zum Ende deines nächsten Zuges die Kontrolle über das Artefakt.

Para su desgracia, no era capaz de luchar y agarrar su tesoro a la vez.

Ladronzuelo de tesoros

Siempre que un oponente gire un artefacto para obtener maná, gana el control de ese artefacto hasta el final de tu próximo turno.

À son grand désarroi, il ne pouvait pas à la fois se battre et garder la main sur son trésor.

Chipeur de trésor

À chaque fois qu'un adversaire engage un artefact pour du mana, acquérez le contrôle de cet artefact jusqu'à la fin de votre prochain tour.

Con suo grande disappunto, non poteva lottare e anche tenere il suo tesoro.

Arraffatore di Tesori

Ogniqualvolta un avversario TAPpa un artefatto per attingere mana, prendi il controllo di quell'artefatto fino alla fine del tuo prossimo turno.

残念なことに、宝物を抱えて戦うことはできなかった。

宝捕り

対戦相手がマナを引き出す目的でアーティファクト１つをタップするたび、次のあなたのターン終了時まで、そのアーティファクトのコントロールを得る。

Para sua decepção, ele não conseguia lutar e segurar seu tesouro ao mesmo tempo.

Batedor de Tesouros

Toda vez que um oponente virar um artefato para gerar mana, ganhe o controle daquele artefato até o final do seu próximo turno.

Treasure Nabber

Whenever an opponent taps an artifact for mana, gain control of that artifact until the end of your next turn.

The Law of Givesies Backsies is respected by every noble pursuer of shiny things.

Commander Masters

"Opposable thumbs, opposable toes, prehensile tails, boundary issues . . . no treasure is safe from a goblin."
—Captain Lannery Storm

Tales of Middle-earth Commander

Treasure Chest

An artifact is "tapped for mana" when a player activates a mana ability of an artifact that includes {T} (the tap symbol). Notably, tapping an artifact to pay for a spell with the improvise keyword is not tapping that artifact for mana.

If an opponent taps an artifact for mana during your turn, you'll gain control of it and keep control of it until the end of your next turn.

If multiple players each control Treasure Nabbers, an artifact tapped for mana will make quite a journey. For example, if player A taps an artifact for mana during their turn, and players B and C are the next players in turn order who control Treasure Nabbers, C's ability resolves before B and C gains control of the artifact. Then B gains control of the artifact. B keeps it during their turn, and then C regains control of the artifact once B's effect expires, then A will have it back after C's expires. However, if B or C taps the artifact for mana, one of them will take it from the other. You may need to pay very careful attention to which effects are still in effect, which have expired, and who owns what.

If the artifact leaves the battlefield, Treasure Nabber doesn't nab it from the zone it moved to.

If you control multiple Treasure Nabbers, their effects all expire at the same time. You won't keep an artifact for any longer.

In a multiplayer game, if a player leaves the game, all cards that player owns leave as well. If that player controls any nabbed treasures, the effect giving that player control of those artifacts ends.

The artifact remains tapped when you gain control of it.