Oliviana, Witness to the World

When Oliviana enters the battlefield, create The Masterwork, a legendary green artifact token with indestructible and "At the beginning of your upkeep, if this artifact has 7 or more brushstroke tokens on it, you win the game."

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 target artifact.