Exiling cards effectively removes them from the gamein fact, Magic originally used that phrasing
It can also serve as a defensive measure, forcing out a threatening Pokemon to keep your own cards safe for another turn
If white is splashed, Kismet in combination with Stasis, or Winter Orb, serves as a strong lock strategy
Whenever you cast a spell from anywhere other than your hand, this artifact deals 1 damage to each opponent
Ramp shells, Tron builds, and Commander decks built around big-mana engines all benefit from having a reset button that sticks around afterward
At just three mana, you can easily accelerate it out with other cards like Chrome Mox and Lotus Petal, meaning the creature can reliably be cast on turn two (or even on the first turn, depending on your draws)