Lavinia of the Tenth

The static abilities of a detained permanent still apply. The triggered abilities of a detained permanent can still trigger.

The mana value of a creature token is 0 unless that token is a copy of another creature, in which case it copies that creature's mana cost.

Lavinia's ability doesn't affect permanents an opponent gains control of after its enters-the-battlefield ability has resolved. Similarly, if you gain control of a detained permanent after that ability resolves, it will continue to be detained until your next turn.

If a permanent's activated ability is on the stack when that permanent is detained, the ability will be unaffected.