Constructed Formats and the 60-Card Minimum In most constructed formats, the minimum deck size is 60 cards
Invasion of IkoriaInvasion of Ikoria Ooooh, now we're talking
That said, fast mana tends to offer fixing as well, so its not unreasonable to try him out
You can find my other precon upgrades here: Blood Rites is a White / Black Vampire Aristocrats deck: the goal of the deck is to flood the board with vampires (Oathsworn Vampire), sacrifice them for value (Master of Dark Rites), and get even more value from sacrifice payoffs (Blood Artist)
The best choice for you will depend on the cards you have to sell, and how much prep work you're willing to do
Especially with Wizards ' focus on coverage and the return of the Modern Pro Tour, it seems exceedingly unlikely Second Sunrise will rise again in the format anytime soon