I am not sure of these numbers. I am 100% sure the listed ingredients are the cheapest to make the desired precursor, but I am not 100% on the average number of tries to get the precursor (the current estimate is from other people publishing their results - mostly from reddit's Nugkill).
Spirit Shard and Karma Items excluded (Allow SS and Karma items)
The Bard
Carcharias
Chaos Gun
The Chosen
The Colossus
Dawn + Dusk
The Energizer
Howl
The Hunter
Leaf of Kudzu
The Legend
The Lover
Rage
Rodgort's Flame
Spark
Storm
Tooth of Frostfang
Venom
Zap
Random Precursor from weapons
Random Precursor from any rare item
1 Mystic Forge Stone currently costs 15
05
70
to buy (It's only recommended to use it to take the place of an item worth more than that, or you get them for free)| Rare Ingredients | |||||
|---|---|---|---|---|---|
| Precursor | Price to MF | Ingredient 1 | Ingredient 2 | Ingredient 3 | Ingredient 4 |
 Leaf of Kudzu Exotic Weapon LongBow 80 6.37- / day  182 0027219 0908The cheapest 10 Rares used in the calculation | 4 bought Rares 387 1617(-52%) profit 781 attempts = 2,342 initial rares | Berserker's Soft Wood Longbow of Serpent Slaying Rare 60, buy for 15 122.31-+ / day | Elonian Recurve Rare 80, buy for 17 00172.61+ / day | Elonian Recurve Rare 80, buy for 17 00172.61+ / day | Elonian Recurve Rare 80, buy for 17 00172.61+ / day |
| 3 bought + 1 crafted Rares 552 9293(-66%) profit 781 attempts = 2,342 initial rares | Berserker's Soft Wood Longbow of Serpent Slaying Rare 60, buy for 15 122.31-+ / day | Elonian Recurve Rare 80, buy for 17 00172.61+ / day | Elonian Recurve Rare 80, buy for 17 00172.61+ / day | Carrion Krait Recurve Bow Rare 80, craft for 45 31Expand Recipe | |
| 2 bought + 2 crafted Rares 718 6968(-74%) profit 781 attempts = 2,342 initial rares | Berserker's Soft Wood Longbow of Serpent Slaying Rare 60, buy for 15 122.31-+ / day | Elonian Recurve Rare 80, buy for 17 00172.61+ / day | Carrion Krait Recurve Bow Rare 80, craft for 45 31Expand Recipe | Carrion Krait Recurve Bow Rare 80, craft for 45 31Expand Recipe | |
| 1 bought + 3 crafted Rares 884 4643(-79%) profit 781 attempts = 2,342 initial rares | Berserker's Soft Wood Longbow of Serpent Slaying Rare 60, buy for 15 122.31-+ / day | Carrion Krait Recurve Bow Rare 80, craft for 45 31Expand Recipe | Carrion Krait Recurve Bow Rare 80, craft for 45 31Expand Recipe | Carrion Krait Recurve Bow Rare 80, craft for 45 31Expand Recipe | |
| 4 crafted Rares 1,061 2401(-82%) profit 781 attempts = 2,342 initial rares | Carrion Krait Recurve Bow Rare 80, craft for 45 31Expand Recipe | Carrion Krait Recurve Bow Rare 80, craft for 45 31Expand Recipe | Carrion Krait Recurve Bow Rare 80, craft for 45 31Expand Recipe | Carrion Krait Recurve Bow Rare 80, craft for 45 31Expand Recipe | |
| Exotic Ingredients | |||||
| Precursor | Price to MF | Ingredient 1 | Ingredient 2 | Ingredient 3 | Ingredient 4 |
Leaf of Kudzu Exotic Weapon LongBow 80 6.37- / day 182 0027219 0908The cheapest 6 Exotics used in the calculation | 4 bought Exotics 176 1941(6%) profit 139 attempts = 416 initial exotics | Berserker's Soft Wood Longbow of Purity Exotic 70, buy for 39 584.86-+ / day | Berserker's Soft Wood Longbow of Purity Exotic 70, buy for 39 584.86-+ / day | Rampager's Pearl Stinger Exotic 80, buy for 45 094.74+ / day | Rampager's Pearl Stinger Exotic 80, buy for 45 094.74+ / day |
| 3 bought + 1 crafted Exotics 407 0965(-54%) profit 139 attempts = 416 initial exotics | Berserker's Soft Wood Longbow of Purity Exotic 70, buy for 39 584.86-+ / day | Berserker's Soft Wood Longbow of Purity Exotic 70, buy for 39 584.86-+ / day | Rampager's Pearl Stinger Exotic 80, buy for 45 094.74+ / day | Rabid Pearl Stinger Exotic 80, craft for 2 6701Expand Recipe | |
| 2 bought + 2 crafted Exotics 637 9989(-71%) profit 139 attempts = 416 initial exotics | Berserker's Soft Wood Longbow of Purity Exotic 70, buy for 39 584.86-+ / day | Berserker's Soft Wood Longbow of Purity Exotic 70, buy for 39 584.86-+ / day | Rabid Pearl Stinger Exotic 80, craft for 2 6701Expand Recipe | Rabid Pearl Stinger Exotic 80, craft for 2 6701Expand Recipe | |
| 1 bought + 3 crafted Exotics 874 6343(-79%) profit 139 attempts = 416 initial exotics | Berserker's Soft Wood Longbow of Purity Exotic 70, buy for 39 584.86-+ / day | Rabid Pearl Stinger Exotic 80, craft for 2 6701Expand Recipe | Rabid Pearl Stinger Exotic 80, craft for 2 6701Expand Recipe | Rabid Pearl Stinger Exotic 80, craft for 2 6701Expand Recipe | |
| 4 crafted Exotics 1,111 2697(-83%) profit 139 attempts = 416 initial exotics | Rabid Pearl Stinger Exotic 80, craft for 2 6701Expand Recipe | Rabid Pearl Stinger Exotic 80, craft for 2 6701Expand Recipe | Rabid Pearl Stinger Exotic 80, craft for 2 6701Expand Recipe | Rabid Pearl Stinger Exotic 80, craft for 2 6701Expand Recipe | |
Help and Info:
● Gives a list of all precursors for you to select, then tells you the cheapest ways to make the precursor you selected by throwing them into the Mystic Forge.
● The top combination will have all purchased ingredients. The second combination will have 1 crafted and 3 purchased ingredients. The third combination will have 2 crafted and 2 purchased ingredients. The fourth combination will have 3 crafted and 1 purchased ingredients. The last combination will have all crafted ingredients. You can pick which you want to use.
● 'Precursor' is which precursor is being made, and the buy order and sell listing prices for that precursor.
● 'Price to MF' is how much it costs to buy all the ingredients that will give you 1 precursor (on average). % profit is if you're selling it. The price and number of items assumes you re-MF any products of failed attempts.
● 'Ingredient 1,2,3,4' is which are the cheapest ingredients to throw into the forge and how much to buy or craft them.
● These are all averages. That means there will be times when no precursor comes out for 1000 attempts, and times when you get 2 in a row, for example. The strategy is that with a statistically significant amount of tries, you will observe the average return.
Precursor Drop Rates:
Drop rates is from research posted on reddit from the production of 289 precursors.
1 in 5 promotes rare to exotic, but appears to have less chance of getting a precursor
Average level of ingredients needs to be at least 75 to guarantee a level 80 (and thus, a precursor)
1 in 139 attempts produces a precursor from exotic (start with 416 exotics, including throwing failures back in)
1 in 781 attempts produces a precursor from rares (start with 2,342 rares, including throwing failures back in)