Bimu, Master of Both Skies

Whenever a spell or ability you control
counters a spell, you may pay {w/u}{w/u}{w/u}.
If you do, discard three cards, then put three
cards from your graveyard on top of your
library in a random order.
{u/b}{u/b}{u/b}: Counter target spell.
Lost between heaven and earth, right and wrong,
black and white.