perpetually
Perpetual effects and counters are not removed from cards that change zones.
If Penregon Besieged gives perpetual "-1/-1"-s, to any Commander. After it dies (any method) and recast from the command zone it looses these perpetual modifications.
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Mortec#41990
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[Deleted User] commented
The permanence of perpetual effects has one exception; as a player's commander moves to the command zone, they may choose to remove all perpetual effects on their commander. This was initially not the case, and many cards that applied perpetual effects were initially banned from Historic Brawl.