Castor, Warper of Worlds

Hexproof
Castor, Warper of Worlds, has flying as long as
you control a land of each basic land type.
Lands your opponents control lose all abilities
and have "{t}: Add {c}" and "{c}, {t}: Add one
mana of any colour."
Whenever Castor deals combat damage to a player, you gain control of target land they control.