A mill deck uses a strategy that depends on emptying its opponents library, rather than reducing their life total
Heres a look at each new Commander Deck, courtesy of Wizards of the Coast
A new card type, especially with a rules-bearing subtype, is an exceptionally high amount of work, but this is a pretty great example of how additional tasks fall out beyond the obvious work necessary to implement new mechanics
It shuts down activated abilitiesthink planeswalkers, fetch lands, or combo pieceswithout needing to target anything
With a Progenitus and Klothys on the battlefield, we just need one more red or green mana symbol to make Klothys into a 4/5 indestructible threat
Your primary route to victory will typically consist of overwhelming artifact token production leading to mass artifact sac to drain the table