Leyline Binding

Leyline Binding's domain ability doesn't change its mana value, which is always 6.

In a multiplayer game, if Leyline Binding's owner leaves the game, the exiled card will return to the battlefield. Because the one-shot effect that returns the card isn't an ability that goes on the stack, it won't cease to exist along with the leaving player's spells and abilities on the stack.

If Leyline Binding leaves the battlefield before its enters-the-battlefield ability resolves, the target permanent won't be exiled.