They never had a really coherent theme, but Captain N'ghathrod brings them together as mill machines, resurrecting what is then put into the graveyard
There and Back AgainThere and Back Again - 54,944 decks This isn't the first Saga on the list to boast a combo, but it is one with a pretty popular engine, figuring in over 3,000 EDHREC decks: With Academy ManufactorAcademy Manufactor, Mirkwood BatsMirkwood Bats, and There and Back AgainThere and Back Again, you can create 42 tokens and deal 42 damage to the rest of the table and that's before even sacrificing anything
Build Around Shared Synergies Both Commanders should function as part of the same engine
Lands (16) Spells (44) 4 Brainstorm 4 Vampiric Tutor 1 Mystical Tutor 2 Yawgmoth's Will 4 Mana Vault 4 Dark Ritual 1 Megrim 4 Memory Jar 4 Defense Grid 4 Tinker 4 Mox Diamond 4 Lotus Petal 4 Lion's Eye Diamond Sideboard Like all of the most broken decks in Magic history, it featured two Yawgmoths Wills, because there was plenty of time to find one you know, later in your first turn