Angel of Despair Deathpact Angel Drana and Linvala Firja, Judge of Valor Liesa, Forgotten Archangel Liesa, Shroud of Dusk Magister of Worth Selenia, Dark Angel Seraph of New Phyrexia Seraph of the Scales
While clunky and gimmicky, when they worked, they could be downright impossible to overcome
While perhaps different now thanks to the London mulligan rule, in the past, people have calculated that your odds of winning when you mulligan to six (so starting with one less card than your opponent) is 40%, which might not sound like a lot, but considering that the odds are 50/50 with each player starting with an equal number of cards in hand, it's actually a 20% shift in your chances of winning the game
Night Soil There was a chance but no
I think there's some steps involved to making this valuable, but in a spell-slinging or maybe prowess style deck, or some form of Bogles, maybe this could pay off