Continuous Trap Card
Each time a monster is Summoned, the opponent must activate this effect: Look at and reveal 1
monster from your Deck with a different name, then shuffle the revealed card into the Deck.
As long as this card remains face-up on the field, the Summoned monster's name, Attribute
and Type become the revealed monster's name, Attribute and Type. Once per Duel, while this
card is in the Graveyard: You can place it face-up in your Field Card Zone as a Field
Spell Card. (This card is NOT treated as a Trap Card.)
Forgive me if the card name is too "on the nose" haha... but here is my submission, Halloweenland,
a Trap Card that is meant to throw a huge wrench into your opponent's plans to utilize specific card names,
Attributes, or Types to achieve their plans, just like DNA Surgery and DNA Transplant. While the "masking"
of the monster is required, this can still be abused by the opponent (in very rare instances) to their gain to
achieve certain card effects or monster summonings. Additionally, this also requires YOU to not be attached
to your monster's name, Attribute, or Type, since the opponent can be running monsters very different
from your own. The last effect is just an additional flavor showcasing the "transforming" effect of the card
while also allowing it to be more efficient due to self-revival. This is a generic card that I don't believe would
fit into any specific archetype, and at most can be treated as powerful anti-meta or a sideboard card.