Sigil of Luck

Sigils of Luck focus on Magic Find, and it is one of the Stat bonuses sigils which stacks up to 25.

[edit] Minor Sigil of Luck

“
Double-click to apply to a Weapon. Gain +0.2% Magic Find each time you kill a foe. (max 25 stacks; ends on downed)
— In-game description

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Major Sigil of Luck

“
Double-click to apply to a Weapon. Gain +0.4% Magic Find each time you kill a foe. (max 25 stacks; ends on downed)
— In-game description

Ingredients
1 Darksteel Ingot
1 Gold Doubloon

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Superior Sigil of Luck

“
Double-click to apply to a Weapon. Gain +0.6% Magic Find each time you kill a foe. (max 25 stacks; ends on downed)
— In-game description

Ingredients
1 Orichalcum Ingot
1 Platinum Doubloon
1 Glob of Ectoplasm

At the maximum of 25 stacks, these sigils grant 5%, 10%, and 15% magic find respectively.

Bug:

The suffix when applied to a weapon says, "of accuracy" rather than "of luck". This does not affect what it does in-game mechanically, however.