Last but not least, this deck isn't dredge. It's flexible and attacks from more than one angle. If more Mentor players start bringing in Cage against me, I can adjust my sideboard plan accordingly and either take advantage of their tactic or counter it.
Firstly, Dredge doesn't just attack from one angle. The DD/ Dredge decks attack from two or more different angles.
Second, there is a kind of circular quality to these back-and-forths.
I say: Card X creates difficulty for your deck.
You (not you Shawn, but whomever I'm talking to) say: But my deck can defeat Card X. All I have to do is A, B, and C.
I say: Yes, I realize you can do all of that. It sounds like a decent plan, and it mitigates the damage that card X does to you. But it's still not ideal for you. You would be better off if players didn't use card X against you.
And you say: But I can still defeat players who use Card X.
And, I say: I never said you couldn't. Just pointing out that it takes away some of your natural advantages/strengths...
And so on, and on ad infinitum.
No Dredge decks wants to face gaveyard hate. No combo deck using lots of free spells wants to face Sphere effects. No Paradoxical Outcome deck wants to face Null Rod effects. No Workshop decks wants to face artifact hosers. And no Gifts deck wants to face Grafdigger's Cage.
Does that mean those decks can't beat those tactics? Of course not. There is rarely such a thing as a complete silver bullet in Magic. Going back as far as when White Weenie was able to Disenchant Moat, there is rarely a card that can't be overcome. Dredge can beat Rest in Peace. Workshops can beat Energy Flux. PO can beat Null Rod. And Gifts & Oath can beat G. Cage.
But dealing with those tactics often means unusual distortions or suboptimizing the deck in other matchups. A Dredge deck that plans for GY hate by stuffing 10 bounce spells maindeck is less consistent. That same principle applies to any deck facing any match in Magic.
If you go some strange or unusual plan to deal with the threat, that doesn't render the threat meaningless. It's very presence has fundamentally changed your deck's game plan and/or eaten up SB space, potentially making other matchups dicier.
I undersatnd that people get very defensive/touchy whenever anyone points out that there are strong tactics against their preferred strategy, and that might make it difficult to understand what I'm saying in non-hyperbolic terms, but I'm not saying your deck, whatever that might be, sucks and can't win games.