Royal Waterways

Royal Waterways enters the battlefield tapped.
When Royal Waterways enters the battlefield,
return a land you control to its owner's hand.
Tap: Add {u}{b}
Aren't these waterways thrilling? A labyrinth of pipes
and tunnels... I couldn't have asked for a better place
to employ my talents. It's all so orderly, so considered, nothing like the crude irregularity of those caverns...
—Cornifer