Unban 15 Mana Emrakul

I'm of the opinion that with the current power level of cards that 15 mana emrakul could be unbanned without much issue. Most of the ways you could cheat her out would skip the cast trigger giving you an extra turn so opponent have a rotation to figure something out for it and there is a new ulamog that can pretty easily have more than annihilator 6. But people keep saying "Well if she's in the commander zone people could get her out too fast." When I try to ask the how they just point at eldrazi temple and grim monolith and say there's plenty of ways to make a lot of mana in colorless. I personally can not think of even a magical christmas land way of getting her out crazy fast with only 8 cards to start the game. So I'm here to ask you, with [[Emrakul, Aeons Torn]] as your commander, what is the fastest magical christmas land to casting her?