Changeling (This card is every creature type.)
Reach
When Webweaver Changeling enters the battlefield, if there are three or more creature cards in your graveyard, you gain 5 life.
If there aren’t three or more creature cards in your graveyard as Webweaver Changeling enters the battlefield, its ability doesn’t trigger at all. If there aren’t three or more creature cards in your graveyard as the ability resolves, you don’t gain 5 life. These don’t have the be same creature cards at both times.