Dia, Saint of the Opal Valley

Whenever a player casts a spell, create a 2/2
white Pegasus creature token with flying. This
ability triggers only once each turn.
As long as you control six or more Pegasus creatures, you can't lose the game and your
opponents can't win the game.
{3}{g/w}{g/w}{g/w}, {t}: Dia and any number of Pegasus creatures you control phase out.