Oliviana, Witness to the World

When Oliviana enters the battlefield, create The Masterwork, a legendary green artifact token with indesctructible and "Whenever you cast a creature spell that doesn't share a creature type with a creature you control or a creature card in your graveyard, put a brushstroke token on this artifact."

At the beginning of your upkeep, if you control an artifact named The Masterwork with 7 or more brushstroke tokens on it, you win the game.