| 10/1/2008 |
The ability checks that creature's power only once: when that creature enters the battlefield. The trigger checks a creature's initial power upon being put on the battlefield, so it will take into account counters that it enters the battlefield 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. |
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