Remnants of Hanweir

When Hanwier, Tarnished Cityscape enters the battlefield, each player sacrifices all lands they control, then searches their library for that many
basic land cards, and puts them into the
battlefield tapped, players who searched
their library this way shuffle their library.
Whenever a land you control leaves the battlefield, target opponent gains control of it,
Lands put into play this way enter the battlefield tapped and are exerted