Your kitty loves you so much, he's trying to teach you how to hunt. It's for your survival, so he thinks. You really should be honored by his thoughtfulness. Seriously, he's trying to teach you how to hunt for food. I would have a problem with any lizard, dead or alive, but my grandmother's cats always brought her lizards, too. Baby bunnies when they could so Grammy could butcher them and then feed the kitties their "treats."
My avatar, Romeo, is a mouser but thankfully doesn't love me enough to try to teach me how to hunt. He's an indoor cat who loves sneaking outside for an adventure.