Monica has in play
1 The Abyss
1 Powder Keg with 0 counters.
and lands
Bill has in play:
1 Academy Rector
1 Wall of Ice, enchanted with Lingering Death (Monica did this to him)
1 Fecundity
1 Liability
and lands
Bill y Monica are at 100 life and have 7 cards in hand. Itīs the turn of Bill.
Beginning fase:
The Abyss destroys Academy Rector. Bill uses its ability and searches Landīs Edge from his library and puts it into play.
Liability, Fecundity and Rector all trigger.  Bill (in any order he chooses) removes Rector from the game and fetches Land's Edge (Rector), loses a life (Liability), and draws a card (Fecundity).  State based effects kill The Abyss (Enchant Worlds); Monica loses a life (Liability)  Draw step happens.
End of phase stats:
Bill:
-1 life (I'm going to keep track of life as a sum of the life lost, rather than the true life total)
9 cards in hand
Wall of Ice; Fecundity; Liability; Land's Edge; lands
Monica:
-1 life
7 cards in hand
Lingering Death; Keg(0); lands
Main fase:
Bill plays Asmira, Holy Avenger.
Bill plays Dual Nature.
Monica taps 2 City of Brass and 1 Forbidden Orchard and throws an Urzaīs Rage at Bill. Bill responds with Mana Drain, targeting Urzaīs Rage.
Bill plays a Raging Goblin.
End of phase stats with respect to the beginning of the scenario:
Bill:
-4 life (previous + Urza's Rage)
5 cards in hand
Raging Goblin; Raging Goblin copy; Spirit token (no Spirit DN copy because the token isn't a card); Asmira; Dual Nature; enchanted Wall of Ice
Monica:
6 cards in hand
-3 life (previous + COB x2)
Keg (0)
Lingering Death on the Wall of Ice
Combat fase:
Monica sacs her Powder Keg at the beginning of combat.
Liability triggers for Monica.  Then:
Spirit token dies.  The Goblin-copy doesn't die because it's a copy and has a CMC of 1.  Fecundity triggers (Spirit).  Liability doesn't trigger because the Spirit isn't a card.  Bill draws a card.  Also, Asmira is going to get a counter from this, but no game action occurs at this moment.
Bill attacks with all he can.
That's a Raging Goblin and a Raging Goblin copy.  Monica can't block, so takes 2 shots in the face.  Pun slightly intended.
Second main fase:
Bill plays Reckless Abandon, saccing his Raging Goblin card as additional cost, target is Monica.
At the beginning of the phase, Bill gets 3 mana from the Drained Rage.
As a result of playing Reckless Abandon:
Liability triggers because a card went to the yard from play.
Fecundity triggers because a creature went to the yard.
Dual Nature triggers because a creature went to the yard.
Asmira's going to get another counter (again, no game action for this though).
Monica takes 4 from the Abandon, Bill loses a life, draws a card, and removes the Raging Goblin copy from the game.  He also mana burns for 3.
End of phase stats:
Bill:
-8 life (3x mana burn + previous)
5 cards in hand
Liability; Dual Nature; Fecundity; Wall of Ice; Land's Edge; lands
Monica:
-10 life (Abandon + previous)
6 cards in hand
Lingering Death(Wall of Ice), lands
End of turn:
After the resolution of the ability of Asmira, Bill plays Fling saccing Asmira, target is Monica.
Lingering Death triggers.  By APNAP rules, it goes on the stack on top of Asmira's ability.  Wall of Ice dies.  Fecunidity triggers for Bill.  Liability triggers for Bill.  State base effects kill Lingering Death.  Liability triggers for Monica.  
Bill loses a life and draws a card.
Monica loses a life.
Asmira's trigger resolves.  3 creatures went to the yard, so she's a 5/6.
Fling deals 5 damage to Monica.  Liability triggers for Bill.  Fecundity triggers for Bill.
Pre-land-throwing fest stats:
Bill:
-10 life
7 cards in hand
Liability, Dual Nature, Fecundity, Land's Edge, lands
Monica:
-16 life
6 cards in hand
lands
Now the two players throw all their cards (they are all lands) at each others head using the Landīs Edges ability.
The turn of Bill ends. He lights up a cigar.
The question: track the life totals of Bill and Monica during this turn.
Bill loses 12 life from the land fest (6 * 2).  Monica lost 14 life from the land fest (7 * 2).  Bill has lost 22 life total.  Monica has lost 30 life total.  Monica is at 70 and Bill is at 78.