The Crystal Has Chosen

If you control a Crystal Planeswalker and a
Legendary Human Warrior creature, you may
exile those two targets; If you do, search your
library and/or graveyard for a Crystal
Planeswalker and put that card into your hand.
If you searched your library this way, shuffle it.
"In times of danger, the Crystal will choose a host,
one of royal blood, to protect itself and its people."