With an influx of new Sagas in the new Doctor Who set, more on their way in Lost Caverns of Ixalan, and also in Wilds of Eldraine, Sagas have been getting a lot of support lately in Magic: The Gathering. Is it too much? Mechanics like Treasures, for example, can feel oversaturated when there's too much exposure to them in a relatively short amount of time. Exceptionally broken cards often end up coming out of archetypes and certain mechanics if they become too oversaturated, as the more cards being made means that the more chances that any individual card is broken. Fable of the Mirror Breaker and Urza's Saga are good examples of Saga cards that may be beginning to wear out their welcome.
Source：https://www.cbr.com/magic-the-gathering-should-sagas-end/
