negate that monster's effect, and if the detached material was a "Galaxy" card, destroy that card
They exist for one purpose: to hunt down and destroy all Synchro Monsters, once and for all
White Mage gets Lifelink, Thief cannot be blocked, and Black Mage has Deathtouch
Along with this useful effect, it can also add an Ogdoadic Spell/Trap card from the deck to the hand, which makes Nauya, the Ogdoadic Remnant one of the most reliable Reptile-type monsters ever printed
Jund: With Jund, you have two main options: first, you can embrace the ramp theme, improve the finishers, and play a good-stuff / ramp deck
Regardless of the quest's conclusion, neither answer is even remotely close to the correct answer: it's either a wall clock or a ritual dagger Zephir stole from Marrow Castle