Up until now.

I began playing Magic when Fallen Empires was a new set. I stopped playing after Ice Age.
I began again during Tempest and stopped after Mercadian Masques.
I began again during Onslaught and stopped after Legions.
I began again when the Commander decks were released, but I limited myself to only Elder Dragon Highlander (EDH) which is the same format as commander.
Last week at FNM, I played in Standard (Type II) for the first time in roughly a decade (Since Masques).

Since I was (and still am) a big fan of Commander (EDH) I purchased a box of the 4 newest sets (M2012, Innistrad, Dark Ascension, and Avacyn Restored). I scoured the internet for decklists that matched the cards that I actually owned. I found that I owned 4 Delver of Secrets so I built a Blue/Red Delver deck.

And that, is "up until now".