Beyond that I'd focus on picking up powerful staples, like Vampiric Tutor, Demonic Tutor, and Diabolic Intent swapping in for weaker tutors, and Cyclonic Rift for that sweet one-sided wipe
Sanctum of Ugin is an essential element to Metalwork Colossus decks as a way to tutor up additional copies of the huge haymaker
Rayquaza VMAX Rayquaza is included on this list primarily for its impressive appearance rather than any particularly strong effects
My Verdict: Deadly Disguise is perfect for players who enjoy trickery, surprise plays, and mastering hidden threats in Commander games
Suspend, the card, kinda does that in reverse
It is not to be used during a duel, but you can swap cards between it and the main and/or extra deck between the duels in a match