Yaharn, God of Kingdoms

When Yaharn enters the battlefield, each land you control becomes a 0/7 creature wall in
addition to its other types until he leaves the battlefield, creatures you control cannot have their toughness lowered, then draw a card for each
creature you control.
—
"Yaharn ordered the stones into brick, then the
brick into walls, and then walls into a kingdom", Founding of Bant