If you can survive to the late-game, Pull from Tomorrow is an exceptional reward
They wanted to make an exciting card, and drawbacks like needing to tap to make mana simply weren't exciting enough for Vivi
Adam Prosak, the Core Set 2021 set design lead, was already working on a vertical cycle associated with the five monocolor planeswalkers in the set
2017-02-09 Abilities that create replacement effects, such as a permanent entering the battlefield tapped or with counters on it, can't be targeted
Its flash speed and evoke option let you interrupt combos like Living End or Dredge by tucking your opponents graveyard into their deck
While exceptionally expensive, there are quite a few ways in black to generate tons of mana very easily, making it not too difficult to cast later in a game