Xandra, Cruel Oracle

At the beginning of each player's upkeep,
that player can pay 3 life or reveal the top
card of their library.
{t}: each player mills a card and loses 1 life.
{b}{r}{g}{t}: exile a card of from your graveyard.
You may play it this turn. Activate this ability
only any time you could cast a sorcery.
"Stop fighting the future i'm seeing for you"