Sa'Ial, Arbiter of Dust

Flying, hexproof
Sa'Ial, Arbiter of Dust is a desert unless you
control seven or more other sand or desert
permanents. (It's a colorless Desert land.)
When Sa'Ial, Arbiter of Dust or another land
enters the battlefield, create a 1/1 colorless Sand creature token.
{t}: Add {r}{g}.