Matrael, angel of eternity

Flying, lifelink, indestructible
All creatures you controle have reincarnation
(When that creature dies and is sent to the graveyard,
exile there instead. Search your library for a creature
card with mana cost less than or equal to the exiled
creature's and put it onto the battlefield.)
At the begenning of your upkeep pay
{1}{b}{w}{g} or sacrifice matrael.