They offer a buy list where you can sell your cards for cash or store credit
Someone should be ready to time you or count down from ten
If there were fewer, I could maybe maintain a deck for each, but as someone who might play cEDH, Old School, Premodern, Legacy, Modern, Pioneer, Standard, Pauper, and even Vintage, its just too much to keep a tournament ready deck for anything I might want to play
Proxies are popular in EDH as well, another singleton format with many of the same characteristics as Cube
Creature - Wolf Color tag templates(None) Quilled Wolf : This creature gets +4/+4 until end of turn
With spells like Farseek and Rampant Growth fairly common and Simic Signet and Explore being common turn two plays, Growth Spiral looks even more attractive