Laubwald-Koloss

Reichweite{3}{G}{G}{G}: Monstrum 3. (Falls diese Kreatur nicht monströs ist, lege drei +1/+1-Marken auf sie und sie wird monströs.)Wenn der Laubwald-Koloss monströs wird, zerstöre eine fliegende Kreatur deiner Wahl, die ein Gegner kontrolliert.

Coloso enramado

Alcance.{3}{G}{G}{G}: Monstruosidad 3. (Si esta criatura no es monstruosa, pon tres contadores +1/+1 sobre ella y se convierte en monstruosa.)Cuando el Coloso enramado se convierte en monstruoso, destruye la criatura objetivo con la habilidad de volar que controla un oponente.

Colosse arboricole

Portée{3}{G}{G}{G} : Monstruosité 3. (Si cette créature n'est pas monstrueuse, mettez trois marqueurs +1/+1 sur elle et elle devient monstrueuse.)Quand le Colosse arboricole devient monstrueux, détruisez une créature avec le vol ciblée qu'un adversaire contrôle.

Colosso degli Alberi

Raggiungere{3}{G}{G}{G}: Mostruosità 3. (Se questa creatura non è mostruosa, metti tre segnalini +1/+1 su di essa e diventa mostruosa.)Quando il Colosso degli Alberi diventa mostruoso, distruggi una creatura bersaglio con volare controllata da un avversario.

高木の巨人

到達{3}{G}{G}{G}：怪物化３を行う。（このクリーチャーが怪物的でないなら、これの上に＋１/＋１カウンターを３個置く。これは怪物的になる。）高木の巨人が怪物的になったとき、対戦相手がコントロールする飛行を持つクリーチャー１体を対象とし、それを破壊する。

乔木巨像

延势{3}{G}{G}{G}：蛮化3。（如果此生物未蛮化，则在其上放置三个+1/+1指示物且它已蛮化。）当乔木巨像蛮化时，消灭目标由对手操控且具飞行异能的生物。

Arbor Colossus

Reach
{3}{G}{G}{G}: Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.)
When this creature becomes monstrous, destroy target creature with flying an opponent controls.

Commander 2015

Reach{3}{G}{G}{G}: Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.)
When Arbor Colossus becomes monstrous, destroy target creature with flying an opponent controls.

Theros

Reach
{3}{G}{G}{G}: Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.)
When Arbor Colossus becomes monstrous, destroy target creature with flying an opponent controls.

An ability that triggers when a creature becomes monstrous won't trigger if that creature isn't on the battlefield when its monstrosity ability resolves.

Monstrous isn't an ability that a creature has. It's just something true about that creature. If the creature stops being a creature or loses its abilities, it will continue to be monstrous.

Once a creature becomes monstrous, it can't become monstrous again. If the creature is already monstrous when the monstrosity ability resolves, nothing happens.