Her I Trust You ability lets a player look at the top two cards of a deck and take one into their hand every time she quests, generating plenty of card draw and making it easier to get a specific target
This is only when you first play Elsa, but it can be devastating and game changing depending on what cards your opponent was hoping to use against you
And this Sisu annoyingly doesn't even curve out into the Floodborn Sisu, which wants to Shift on turn 6
Myriad itself is a nuts mechanic
Dredge doesn't involve discarding in any way
And across those commanders, it offers a little of everything: It has wildly busted legends for cEDH, casual bangers, niche build arounds, and even reprints of some of the most powerful and iconic legends to ever grace the command zone