If Faunsbane Troll's activated ability resolves, its effect causes the creature to be exiled any time it would die that turn, not just if it would die as a result of damage dealt by Faunsbane Troll
Running only two colors makes the set of Citadels a painless include, and we can dig for the indestructible land with Oath of Nissa to set up a turn two Boom
Thud One of the things I love about Fling is the name
Theres also Prosperous InnkeeperProsperous Innkeeper, Ravenous SquirrelRavenous Squirrel, and Moldervine ReclamationMoldervine Reclamation, as well as some aristocrat life drain happening, with Zulaport CutthroatZulaport Cutthroat, Nadiers NightbladeNadiers Nightblade, and Bastion of RemembranceBastion of Remembrance
6 Everlasting Torment Wither Away Like Leyline of Punishment, Everlasting Torment will stop you gaining life alongside your opponents
No game changers No mass land denial No extra turns No two-card infinite combos (game-enders, lockouts, or infinite) Few tutors 2