The only thing we don't know is how many Mystic Clovers and Ectos you need for component 3, but I am sure someone will post that soon.
Step 1 - Mystic Forge Gifts
Gift of Magic = t6 fang (250) + t6 scale (250) + T6 claw (250) + T6 bone (250)
Gift of Might = T6 Blood (250) + t6 Venom (250) + T6 totem (250) + T6 dust (250)
Obsidian Shard (10) + Glob of Ectoplasm (10) + Crystal (10) + Mystic Coin (10) = 20-50 Random t6 Fine mats or Mystic Clovers
Step 2 - Crafted Gifts
Crafted Gift 1 = Gift of metal/wood/energy
Crafted Gift 2 = Gift of <uses Dungeon tokens>
Step 3 - WvW and Exploration Gifts
Gift of Battle = 500 Badges of honor
Gift of Exploration = 100% Map completion
Step 4 - Component Creation
Bloodstone shard + Gift of Exploration + Obsidian Shard (250) + Gift of Battle = (Component 1)
Crafted Gift 1 + Crafted Gift 2 + Icy Runestone (100) + Superior Sigil of X = (Component 2)
Glob of Ectoplasm(?) + Mystic Clover(?) + Gift of Magic + Gift of Might = (Component 3)
Step 5 - Your legendary
Base Exotic + Component 1 + Component 2 + Component 3 = Legendary