古霊の踏み行く処 {4}{R}

エンチャント

パワーが５以上のクリーチャーが１体あなたのコントロール下で場に出るたび、クリーチャー１体かプレイヤー１人を対象とする。あなたは「古霊の踏み行く処はそれに５点のダメージを与える。」を選んでもよい。

「力あるものの定めは、難しくも複雑でもありません。」 ――アニマのメイエル

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Only the English version of a Magic card receives Oracle updates and errata. View this card in English. (Scryfall note)
The ability checks that creature's power only once: when that creature enters. The trigger checks a creature's initial power upon being put on the battlefield, so it will take into account counters that it enters with and static abilities that may give it a continuous power boost once it's on the battlefield (such as the one on Glorious Anthem). After the creature is already on the battlefield, boosting its power with a spell (such as Giant Growth), activated ability, or triggered ability won't allow this ability to trigger; it's too late by then. Once the ability triggers, it will resolve no matter what the creature's power may become while the ability is on the stack. (2008-10-01)