Nami, The Cat burglar

Ward {4}
Whenever Nami enters the battlefield, take
control of target artifact an opponent control
until nami leaves the battlefield.
Whenever an opponent draws a card except the
first card they draws each turn, create a treasure
token.
Sacrifice 3 treasure : go search your library for an island card put it onto the battlefield tapped then shuffle. Then if you control at least 20 land, you
win the game.