Approach of the Second Sun
 
When this card is cast in the manner it conventionally is, it effectively asks the question "Can you defeat me in seven turns?" For many decks, the answer will be yes, so it's probably more likely that the only decks that look at it will be the kind that basically stop everything from happening, ever. It's pretty slow even by the standards of permission or pillow-fort decks, so I think it'll mostly be appealing for style points (and it gets a lot of uniqueness points too, for being a white Bolas-themed card). Of course, you could always speed things up by having two in hand and Omniscience in play . . .
 
Constructed: 2/5
Casual: 4/5
Limited: 3/5
Multiplayer: 3/5
EDH/Commander: 3/5

Approach of the Second Sun

Any card that says “you win the game” is going to get some attention, and Approach of the Second Sun is an interesting twist on the effect. All it asks is that you cast it twice…though it's perfectly fine if you have to cast it thrice or more. Without intervening circumstances, you're going to win in 7 turns off a resolved Approach of the Second Sun, and it even gives you 7 life to try and keep you alive to that point.

This is a card that does ask for a particular kind of shell to work…it needs to be a deck that can cycle quickly enough through the cards to get to Approach, and it also needs to be able to survive long enough to resolve a seven-mana sorcery that needs to be cast twice. This is not a perfect card for every deck, since the risk is real that you'll be dead long before you get to cast it for the win.

Constructed: 3

Casual: 5

Limited: 4

Multiplayer: 3.5

Commander: 4