Nykthos, Shrine to Nyx was underestimated at first but quickly became an all-star soon afterwards
Three mana is a tad on the expensive side given that you also need to pay the cost of the spell you flashback, but its still doable
You just need some type of outlet that allows you to win off of constantly flickering all of your permanents
On average, players maindeck roughly of their fixing lands, with the remaining being off color. A survey of over 75,000 deck lists drafted from more than 5,600 unique cubes on Cube Cobra can shine some light on how many fixing lands end up maindecked and how many languish in sideboards
If you hard cast Vibrance using two green and two red mana in the total five-mana casting cost, you can activate both of these abilities, all while not having to sacrifice the 4/4 creature immediately
While its still gaining traction globally, its steadily building a player baseand YouTube is starting to reflect that with strong interest in coverage of big tournaments and competitive matches