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Basically all decks are block constructed decks from any block since M10 (all core sets count as 1 single big block).
Each deck consists of 59 cards and 1 commander. The commander can be any rare or mythic rare creature.
We each end up having a multitude of decks and many fun variant strategies.
I just built a scars of mirrodin kuldotha forgemaster deck. A friend of mine just built an Omnath Eldrazi ramp deck.
It can be a lot of fun.