Geysers

Geysers, a new block that spawns deep underground in sulfer caves. Whenever you step on them, there's a 50% chance that you'll get launched into the air. The height that it launches you up depends on what block is below it. If its placed on a magma block, it launches you up 5 blocks. If its placed over lava, you'll get launched up 9 blocks. If its placed on any other block, you only get launched up 3 blocks. Feel free to change any part of my idea!