Honorable Mention #3 - Into the North With the printing of a set of dual lands that have various types that are all about that Snow-ness, Into the North is better than ever before
But the biggest reason it that Treasure Cruise is simply a better way to gain card advantage
To take a mulligan, a player shuffles the cards in their hand back into their library, draws a new hand of cards equal to their starting hand size, then puts a number of those cards equal to the number of times that player has taken a mulligan on the bottom of their library in any order
Only 64 of these cards exist, so theyre extremely rare and valuable
Go get your Nykthos, Shrine to Nyx
Upheaval into just a bunch of mana production, perhaps a card draw planeswalker too is so utterly game over and that set of stuff is without an actual threat