Blue, Light of Mystery

Gain control of X target creatures opponents
control. Untap them. They gain haste until end
of turn. If X is 4 or more, you may cast instants
and sorceries from graveyards without paying
their converted mana costs until end of turn.
Exile all spells cast this way.
Blue is the most innovative of the five. They collect
and covet, the knowledge of generations, fabricating an
aura of enigma, behind which they hide and continue
their research.