Equivocate

Counter target spell. If that spell is countered
this way, you may search your library for a card
with the same converted mana cost and card type
as that spell, put it into your hand, then shuffle
your library.
Ma'atariel's disciples are often seen lurking at the
edges of the conflicts that scar Taav, siphoning the
power expended by the warring sides under the guise of keeping the destruction contained.