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Zu Beginn des Kampfes in deinem Zug legst du so viele +1/+1-Marken, wie Primas Seymors Stärke beträgt, auf eine andere Kreatur deiner Wahl, die du kontrollierst.



: Monstrum X, wobei X gleich der Anzahl an Marken auf den Kreaturen ist, die du kontrollierst.
The value of X is determined only once, as Maester Seymour's last ability resolves.
If Maester Seymour is no longer on the battlefield when its first ability resolves, use its power as it last existed on the battlefield to determine how many +1/+1 counters to put on the target creature.
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.