Essentially, in a table with three opponents, Ophidian Eye will grant you three card draws per spell that you cast, as long as they reach the mana value 3 requirement
Life, death, rebirth, and life eternal, Jetmir's cult carried within them the spirit of the family that would become the Cabaretti before the first migration to New Capenna
If the price is a little on the high side, you can always go for a Cabal Stronghold instead
The disciplines of magic vary greatly across the colleges, from arts to mathematics to eloquence and more
Card draw helps you pull into answers
I personally like to have consistent mana so I dont need to worry about hitting my colours and can focus on playing, taking a budget approach to mana bases just means that youll have less consistency hitting your colours and it may (in rare cases) prevent you from casting cards on curve