When your opponent normal summons, flip summons, or special summons a monster(s) with an ATK of 1500 or more, destroy and remove the monster(s) from play
You're best bet is to go for something like Torrential Tribute while Macro Cosmos or Dimensional Fissure is face-up on the field.
If you wanna clear the graveyard, use cards like Soul Release, Big Burn and D.D. Crow.