The March of 100 Spirits

Instant and Sorcery cards you own and spells you control are permanents.
Whenever an Instant or Sorcery spell you cast resolves, put it onto the battlefield. It becomes a
1/1 blue and white Spirit creature and loses all its abilities.
At the beginning of your end step, if you control
100 or more spirits, sacrifice The March of 100 Spirits, then you win the game.