They are widely popular and provide much-needed mana support and ramp to builds
To round out the deck in support of the Allied troops are Kabira Evangel (providing colour protection for Allies), Talus Paladin (giving some sweet lifelink), Join the Ranks (instant Ally triggers), and Sun Titan (to recur most all other permanents from the grave)
The formula for the Mythic Point is (solving for D): D = (15*4 - P*1/8*11/12 - M)/(N+W*1/8*11/12) Note the factors of 1/8 instead of 7/8
Booster Packs : Discover new and rare cards with each pack
The more legends you play in your Commander deck, the better this gets, but thats not even a heavy lift for decks these daysthere are a ton of great legendary creatures that people just slot into the 99 of their Commander decks
It's great fun in many places too, like control, Curses, Simic Ramp, and more