She's all about setting up sufficient multicolored mana, then fetching up the perfect pieces to secure victory
Of course, there are still a few hoops to jump through, such as having your own creatures to help fuel this mind flayers machinations, but a steady supply of helpers thanks to cards like Sower of Temptation, Beguiler of Wills, and Ghoulcaller Gisa, you wont find yourself wanting
If a different copy of Carnival Barker enters the battlefield, or if Carnival Barker leaves the battlefield and returns, it's a new object and its ability can be activated
It has the power of an ultimate ability, but its not, and you can do it again in a future turn on another player
Any time a double-faced card is visiblewhether because it's in a public zone, because it's revealed, or being looked at by a playerthe players who can see it can see both faces