Sandstone Oracle
{7}
Artifact Creature -- Sphinx
4/4
Flying
When ~this~ enters, choose an opponent. If that player has more cards in hand than you, draw cards equal to the difference.
Slithermuse
{2}{U}{U}
Creature -- Elemental
3/3
When ~this~ leaves the battlefield, choose an opponent. If that player has more cards in hand than you, draw cards equal to the difference.
Evoke {3}{U} (You may cast ~this~ for its evoke cost. If you do, it's sacrificed when it enters.)