Like those, it was banned to avoid the perceived-barrier-to-entry, but was strong enough to be a candidate for banning even without the optics especially in long games where the card draw yields inevitability over time
Of course, there are other targets for it in the format, like Crashing Footfalls, and for a short time where Up the Beanstalk was legal youd draw cards off that when casting this blue instant
Constructing a Cube Cubes are typically around 360 cards on the low end, or 720 cards on the high end
Seemingly every year, the rarest of these see the light of day once again, breaking new records as they are auctioned off for sums even more eye-watering than before
By the way, if your opponent controls a Sundial of the Infinite and you have an artifact removal in your sleeve, such as Krosan Grip, you cant remove Sundial of the Infinite before your opponent activates its ability, as long as your opponent is cunning and smart