Knowing youre the only one that can play combat tricks or removal spells during combat makes it much easier to decide who to attack with what creatures
You likely wont have 9 Ink before turn 9 unless you play a few cards that allow you to fill your Inkpot faster
Finally, we have Rise and Shine
At five mana youre not going to get this flipped before turn 6 at the earliest, but thats about when youre confidently in second spell category anyways
On the flipside, if your key engine costs a ton of mana, like Kozilek, the Great Distortion, a big beefy ramp card like Thran Dynamo will get Kozilek out much earlier than a Mind Stone
Sea Gate, Reborn is mana when you need it early, and Sea Gate Restoration is draw when you need it late