Chaos Orb destroys any cards that it touches when it lands, whereas Falling Star deals 3 damage to any creatures it touches when it lands (and also taps them) and has no effect on non-creature cards
While its not hitting anything large or alive? its still going to hit the majority of mana rocks, engine pieces, equipment and Sol Rings
Resolving the Chain, Retaliating C would be Special Summoned and its Continuous Effect would cause all cards sent to the graveyard to be banished instead
Skyclave Shade Black doesnt have many landfall cards, but Skyclave Shade gives the color a strong card
if your opponent does something you need to respond to, you can do so, and if not, then you get to Dig on their end step
Anti-Magic: Most of the Ancient Gear monsters have effects that stop the opponent from using Spell and Trap Cards when they attack