If I knew I would only be playing control mirrors, I would add the dual lands and play Pyroblast, but I firmly believe against an open field, Id rather have the stability of basic lands and two colors to push through the variety of decks every Legacy event presents
It comes bundled with a Threaten effect, letting you borrow the best creature in play for playing your Manalith
Check the Rosette Pattern Rather than use thousands of colors of ink, printers use a handful of colors in combination
Admiral Brass, Unsinkable is a five-cost Mythic Rare within the Ahoy Mateys Commander Precon, milling four cards upon entering the battlefield
From Merfolk to Elves, from Cats to Scarecrows, if I can find some lords and/or some payoffs, Ill give it a go
Aside from the rotation, its also important to take a look at the ban list and restrictions