1V AND INFINITE

The wording "Once only" or "One time only" or the presence of the "1V" symbol means that the specific Gift activated by that specific card can be resolved a single time for the entire game.

The changes, however, persist until the card is destroyed. If the card is brought back onto the field, the Gift will keep persisting, unless a Gift states otherwise.

In the case of the infinity symbol, it means that the card's Gift is passive: it stays active and can repeat as long as the card is present on the field.

Interactive examples from the rulebook: a comparison between cards with no Gift and cards with an active Gift. The combinations and situations are many, especially if both cards happen to have Gifts.