Neva, artificer prodigy

Spells and abilities in your opponents control
can't cause artifacts be put in a graveyard.
{u}{b}{r}, {t}: Sacrifice an artifact, you may draw
cards equal to its converted mana cost, then
destroy target artifact with converted mana cost
equal to or lower than the sacrificed artifacts converted mana cost.
{u}{u}{b}{r}: Gain control of target artifact.