Though its not quite as destructive as banishing a character for good, being able to waste your opponents ink and actions by sending a character back to their hand - which also means delaying any plans they had to quest or challenge in most cases - is a very useful option, especially if you can do it for free
It can also make combat a nightmare for opponents, since theyll never know what tricks I might have up my sleeve
If your opponent plays Urzas Tower and you turn it into an island, and they then find a second Tower, you can use Felidar Guardian to swap the enchantment over to their Urzas Mine instead, making it just a little harder to beat the early disruption
Getting seven cards deep in two turns with cycling and Glimmer of Genius is also pretty easy, and surviving with seven extra life isnt that big a deal
Arclight Phoenix and Faithless Looting taking so much of the hype is the primary driver of the myth that graveyard hate and cards like Damping Sphere are the best way to attack the deck, as opposed to simply killing their creatures and playing threats that dont die to Lightning Bolt
As with Inti, this provides a nasty double whammy of pressure and card advantage