nightmare and tarantula?

ok so if the update is called 'Mounts of Mayhem' then it should include more than just one (maybe two if you only play survival) new mounts. I propose two more mounts, the Tarantula and the Nightmare.

The Tarantula would be a mount that is capable of climbing walls like a spider and using its webs like a grappling hook so that you can be spiderman.

the Nightmare is a horse variant that is slightly larger than a normal horse and slightly faster. the nightmare could be found in soul sand valleys. if you died, the nightmare would teleport to your spawn point. the nightmare could run across lava and would have a feature where it could levitate at the same Y level (unless you jumped in which the Y level would change) for 10 seconds until falling. the nightmare would take damage in water.