Exa, Enforcer of Nekroz

Tribute 5, Limited 3
If Exa, Enforcer of the Nekroz is exiled from
anywhere you may target one exiled Nekroz
creature and return it to the battlefield
under your control.
If this creature is sacrificed, you may search your
library for a Dragon creature that is also a
Nekroz reveal it, put it in your hand, then
shuffle your library.