My oponet was getting mana screw and i Managed to get all 3 of my {Healer of the Pride} out so I could gain six life per creature
Played 3 {Lingering Souls}
Pass turn
Payed the flashback cost on all of them
Pass turn
Played 2 {Captain's Call}
Pass turn
Played 2 {Midnight Haunting}
Pass turn he finally swings for 4 life after getting out of nana screw
I play {Crusader of Odric}
And a {Oblivion Ring} on his only creature
Pass turn he play {Searing Spear}
I swing all in with him at 17 life
Game over
My largest was probably {Consuming Aberration} with {Way of the Thief} and a {Dimir Guildgate}. The {Consuming Aberration} was about 150/150 or so.
Edit: it was a 4 player game against 80+ decks.
I play a deck that plays {Kiki-Jiki, Mirror Breaker} and {Deceiver Exarch} making infinite Exarchs with an infinite life swing.