Explain how the ability of Lebalcn Everywhere at Once works.

The ability of LeBlanc, Everywhere at Once consists of two parts: a keyword and a static passive ability.

According to the card text:

• [Backline]: As defined in Rule 826, this is a passive ability. It means that during the Combat Damage step, LeBlanc must be assigned combat damage only after all other units you control that do not have [Backline] have already been assigned lethal damage.
• "Your [Temporary] effects at my battlefield don't trigger": This is a passive ability that creates a restriction on your cards.

How it works: If LeBlanc is on a battlefield, any ability or effect you own that has the [Temporary] keyword and is located at that same battlefield will not trigger. Because this is a passive ability, it is a statement of fact that continuously affects the game state while LeBlanc is in play.

This means that if you play a card with [Temporary]—for example, a spell or an ability that says "When I enter, deal 2 damage [Temporary]"—that effect will not activate as long as LeBlanc is present at that battlefield.

If you have additional questions about specific card interactions with LeBlanc, feel free to ask!