Funnily enough, I had a quick look at the Cloudpost deck that made the Top 8 of the very first Modern Pro Tour in Philadelphia back in 2011, and the deck contained four cards that are now banned Cloudpost, Eye of Ugin, Green Suns Zenith and Punishing Fire
The team was targeting fast mana, extra turns, and free spells, which means it's blue that overwhelmingly lost out
Any deck that wants to cheat big creatures into play and doesn't care much about typal synergies can give this a look, as can any deck that can reuse its enters ability to get another double helping of cards to hideaway
This additional cost is informally known as the "commander tax." If you're casting your commander for an alternative cost, such as "without paying its mana cost" or a bestow cost, the commander tax applies in addition to that alternative cost
Credit where credit is due, though, to anyone who can win consistently with an Epic Struggle deck
Everyone knows this, and everyone knows that everyone else is also eager to buy those $1.50 $2.00 Den Protectors before they double or triple in price