Xero, Traitor of the King

Treat this creature as Sedris, the Traitor King
Each creature card in your graveyard has unearth {2}{b}. ({2}{b}:Return the card to the battlefield. The creature gains haste. Exile it at
the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)
"Here lies a traitor."