I've only ever done that once before. To be fair, my 6 rare cards were...eyebrow raising. (specifically, Brazen Borrower, Emry Lurker of the Loch, Castle Vantress, Lochmere Serpent, and two other cards I didn't concern myself with because hot damn that's a lot of blue!) I built a Dimir deck which was a bit short on creatures but had enough shenanigans in it that I could repeatedly (and probably annoyingly) bounce their stuff back to their hand, bounce my stuff back to my hand, and recast it from the graveyard/hand as necessary.) Also, Emry and Witching Well is a really effective and low cost combo (tap Emry, cast Well from graveyard for B, scry 2, sac Well for 3B, repeat next turn. Fair churns through the deck. Nearly decked myself a couple times, actually, but sooner or later you're going to pull the Lochmere beastie, and then it's pretty much gg.)
Quite pleased with myself
