Turf War

縄張り争い (Turf War) (ja)

Enchantment (CMC 5)
When Turf War enters the battlefield, for each player, put a contested counter on target land that player controls.
Whenever a creature deals combat damage to a player, if that player controls one or more lands with contested counters on them, that creature's controller gains control of one of those lands of their choice and untaps it.