Valentine, Waking Force

+2: "Explore the Unknown" - Search your library for one land, then search an opponents library for one land, put them onto the battlefield tapped.
0: "Question Your Sanity" - Swap this card for a different "Sister" (Valentine) from outside the game, keep the same loyalty as this one.
-10: "World Discovery" - Gain control of all lands controlled by players, gain an emblem with "You may play any number of lands per turn."