Baron Slaughter

This build has 3x lifesteal items, on a god that has healing. This is just begging to be shut down by anti-heal. Strongly not suggested.

Baron Samedi doesn't get much out of his basic attacks, so items like Polynomicon and Soul Gem aren't necessarily very good for him. He also doesn't have great lifesteal in his kit, so Typhon's Fang also isn't recommended.

For Joust I'd start with Mage's Blessing, Tiny Trinket, Baron's Brew, and Mana Potions so I can stay out as long as possible. I would then finish Bancroft's Talon and buy either Shoes of Focus or Shoes of the Magi depending upon team comps (I'd go magi if against a squishy comp and focus for more tanky ones). Then I'd either get Chronos' Pendant or Spear of the Magus, which ever one I didn't buy, and Gem of Isolation or a situational item like Divine Ruin or some type of defense like Hide of the Urchin if needed. Situational items to round out the build would be things like Soul Reaver, Rod of Tahuti, Spear of Desolation, or a defense item like Mantle of Discord or Magi's Cloak. I would swap magus for Obsidian Shard if I was the only magical dealer and the enemy had 2+ that were building magical defenses. You can also swap talon for Pythagorem's Piece if you're more focused on utility than damage depending upon your team comp.

poly and typhon's fang on Baron?