What is the fossil combo for +1 to all spell skills on a wand?

For 1 fossil : aetheric, corroded or faceted
For 2 fossils: corroded and metallic
For 3 fossils: Same as 2 and add jagged
for 4 fossils: Same as 3 and add faceted (or aetheric)

Is this correct or are there better combo's?

Can anyone confirm these are the "best" fossil combo's for +1 to all spell skills on a wand?

Fossils do not have combinations. A single fossil allows for certain Delve mods to roll and blocks other mods. +1 to all spell skills is a standard prefix available on any item level 55+ with an extremely low chance to get (weight 50). You can look up available mods on PoeDB.

If your goal is nothing more than to block as many other mods as possible, then that I do not know. Unless you are playing SSF, you’d be better off buying a base with that roll.

My base has 109% increased fire damage fractured.
A base with that fractured and +1 to all spell skills is for the moment out of my price range.

Yeah it is for blocking the most mods and have the highest possible chance to roll +1 to all spell skills.

According to craftofexile.com, Corroded+Jagged+Metallic+Shuddering will block every prefix except % Increased Spell Damage and +1 all Spell skill gems, giving you a 50% chance of rolling the mod.

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ekaye wrote:

According to craftofexile.com, Corroded+Jagged+Metallic+Shuddering will block every prefix except % Increased Spell Damage and +1 all Spell skill gems, giving you a 50% chance of rolling the mod.

That does block every prefix but those two, but would weights not still play a roll? Increased spell damage is weighted at 5670 across 8 tiers whereas +1 spell skills only has a weight of 50. Of course if it rolls two prefixes, it should have to have +1 spell skills. I’m really not that knowledgeable with various high level crafting.

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Aldonés wrote:

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ekaye wrote:

According to craftofexile.com, Corroded+Jagged+Metallic+Shuddering will block every prefix except % Increased Spell Damage and +1 all Spell skill gems, giving you a 50% chance of rolling the mod.

That does block every prefix but those two, but would weights not still play a roll? Increased spell damage is weighted at 5670 across 8 tiers whereas +1 spell skills only has a weight of 50. Of course if it rolls two prefixes, it should have to have +1 spell skills. I’m really not that knowledgeable with various high level crafting.

Since a rare can have up to three prefixes, and this fossil combo blocks all but two (with the various tiers of spell damage being all part of the same mod group, so only one can appear on the item), it's really down to whether the wand rolls one prefix or two. If there's only one, you're right that it will almost certainly be %spell, but with two prefixes, they could only be %spell and +spell gems, because everything else is blocked.