Been playing Exsanguinate Mines. I would recommend, especially as a starter as it sidesteps most of the mana issues since it spends and reserves life.
I must apologize to
dizzie
, I was too harsh on Tremor Rod earlier. I think was assuming if you used Tremor Rod, you had to use Minefield and chain detonations. If you treat "additional detonation" as 100% more damage, Tremor Rod is a pretty good starter. I think it's still outclassed by good rares and I think the additional detonation is a bit clunky under sustained throwing.
Eye of Winter has some interesting mechanics. I think it's dogshit as selfcast(surprise!) since it doesn't travel that far. But if you stick it in a mine or trap, you lessen that downside. Stick a Hydrosphere next to the boss and get at least one chain(support, Snakepit, Deadeye, Gloomfang). Any projectile that hits the Hydrosphere will chain to the boss. Put Sniper's Mark on the boss, any projectile that hits the boss will split towards the Hydrosphere and then chain back to the boss. I'm not 100% sure on that last one, I know you can't chain to the Hydrosphere since it's not an enemy. But last league, Archmage Orb of Storm players seemed confident you could split to it.
If accurate, Sniper's Mark + Snakepit + Hydrosphere = 3x single target. On top of that, the extra bouncing counts towards overall projectile travel distance, so you get more of that 200% more damage bonus. What I have no idea how to estimate is how many projectiles hit the hydrosphere and boss per cast.
Fury Valve also has some interesting possibilities here but I haven't sat down to really think that one through. The person that reported it on Reddit seemed to imply the splitting was very finnicky.