Linvala, Shield of Sea Gate

Activated abilities contain a colon. They’re generally written “[Cost]: [Effect].” Some keyword abilities (such as equip) are activated abilities and will have a colon in their reminder text. Triggered abilities (starting with “when,” “whenever,” or “at”) are unaffected.

In a multiplayer game, if you leave the game after Linvala’s middle ability resolves but before your next turn begins, its effect lasts until your next turn would have begun. It neither expires immediately nor lasts indefinitely.

Linvala’s middle ability won’t trigger at all if you don’t have a full party as your combat phase begins. It won’t affect the target if you don’t have a full party as it resolves. The number of creatures in your party may change between these times, however.

No abilities of the affected permanent can be activated, including mana abilities.

Some cards refer to you having a “full party.” This is true if the number of creatures in your party is four.

The nonland permanent remains affected until your next turn even if the number of creatures in your party changes or Linvala leaves the battlefield.