Castiel, Masterless Mage

Flying
When Castiel, Masterless Mage enters the battlefield you may search your library or
graveyard for a legendary artifact card named
Titan's Shard, reveal it, then put it into your
hand.
Whenever you cast an instant or sorcery spell
you may choose one creature each player controls.
Those creatures gain shadow.
Partners with Gaolang, Unborn yet Living.