The fair bucket is the largest, containing cards that are efficient and powerful, but that have a lot of redundancy within the Cube, such as Lightning Bolt, Counterspell, Llanowar Elves, cheap creatures meant for combat, and even big finishers like Frost Titan
You can choose one of the same modes as many times as you want
In many instances, Sabrina can be used to force a Basic or Stage 1 Pokemon into the Active when they arent ready, setting you up wonderfully for the rest of the match
Ending up down three mana on a discard spell to make the trade isnt ideal, but its probably better than any other trade for Esikas Chariot and about the expectation of losing mana against Goldspan Dragon
This can be ideal for refreshing your hand when it is dead in the water