yugioh pure danger deck Danger! Feets of Strength! - Yu-Gi-Oh! Card Database Danger! Bigfoot! - Structure Deck:

Mewtwo EX Mewtwo EX is an incredibly strong card for several reasons

None of them are perfect, but they'll all do work and both Rogue's Passage and Access Tunnel might also open a few doors

Delirium, which first showed up in the two-part Shadows Over Innistrad/Eldritch Moon block, is a mechanic that gives your cards a bonus under the condition you have four or more different card types among cards in your graveyard

Either you are using low powered cards that cater to every one or you are using narrow cards

One other subtle strength here is the degree of control you can have over exactly when cards are milled, and how many (assuming you have painlands or other unrestricted self-damage sources)