Hermione Granger

{t}: All players reveal the top card of their libraries. If a white card is revealed, put it in owner's hand. If a black card is revealed, exile it. If a green card is revealed, put it on top of the owner's graveyard. Return all other cards to the top of their owners' libraries.
Affinity for white (This spell costs 1 less to cast for each white permanent you control.)