Only 3 lures for multi-species fishing?! I think I’d rather have 3 tackle boxes, and probably 3 different boats!
If you’re going to pin me down, I’m going to say a hook, a sinker, and minnow. That combination will catch about any fish in the lake.
If you want to be species specific, I’d take a jig over any other lure for bass. Pike would happily chase a lipless crankbait, and bass would go after those too. Walleye are going to be more finicky in warm water, so I’d probably use a bubble gum jig head tipped with live bait. That might also score some smallmouth depending upon the body of water.
But really; 3 boats with 3 tackle boxes in each one is the best way to go.