The infamous lockdown is started with these cards:
Chaos Emperor Dragon - Envoy of the End (Also known as CED) is then special summoned, and activates its effect.
When Sangan/Witch of the Black Forest is sent to the graveyard by CED's effect, their effect activates as well. Using that effect, add Yata-Garasu to your hand.
Special Summon Yata-Garasu, and attack directly.