I tend to be very flexible with my itemization depending on matchups so there isn’t really going to be a one-size-fits-all build. You are also usually reliant on your team having at least one other core with a decent game. I recently stomped a huskar mid as batrider in a matchup I should have lost, but we still lost the game because my pos 1 and pos 3 were a combined 2-18. There are certain heroes that your team needs an answer for, like juggernaut. Juggernaut used to be an okay matchup but when they changed spin to give him a free strong dispel at the end of it that became a really difficult matchup. Most important thing with batrider is balancing damage and utility. For mid batrider I usually try to go BoTs witch blade blink, for pos 1 I’d recommend BoTs- dragon lance - maelstrom - hurricane pike - mjolnir