New chunks rarely hide Lucky Blocks (luck −20…+20). Even rarer: a quartz lucky temple with Lucky Blocks (+50…+100) – or a mossy wreck with netherrack (−50…−100). Careful!
Wishing wells come out of Lucky Blocks. Throw a gold nugget, gold ingot, emerald or diamond into the water: one coin is used and the well grants a small wish – the more valuable, the luckier.