Having been warped and expanded to the point where it devoured anything else in the world, Duskmourns rooms are corrupt, evil places ready to trap and confuse anyone who steps inside
Okay, great, get in there and lets do some work
When your opponent activates a card or effect on the field, if you have 3 or more different Monster Types on your field (Quick Effect): You can negate the activation, and if you do, destroy that card
Its also a card you can use to fetch Ancestral Recall in formats like Cube and Vintage
I did manage to set up a sequence where I had The Twelfth Doctor in play, Unlikely Meeting on an adventure, and Quantum Misalignment in hand
Plus, whenever you summon a Vaylantz from the Pendulum Zone, youre locked into Special Summoning Vaylantz or other monsters from the Extra Deck for the rest of the turn